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Merge branch 'jn/format-patch-doc' into maint
[git/mjg.git] / diff.c
blobba45a7df112da57b567e723bae695b330cfdfdba
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 400;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static struct diff_options default_diff_options;
35
36 static char diff_colors[][COLOR_MAXLEN] = {
37 GIT_COLOR_RESET,
38 GIT_COLOR_NORMAL, /* PLAIN */
39 GIT_COLOR_BOLD, /* METAINFO */
40 GIT_COLOR_CYAN, /* FRAGINFO */
41 GIT_COLOR_RED, /* OLD */
42 GIT_COLOR_GREEN, /* NEW */
43 GIT_COLOR_YELLOW, /* COMMIT */
44 GIT_COLOR_BG_RED, /* WHITESPACE */
45 GIT_COLOR_NORMAL, /* FUNCINFO */
46 };
47
48 static int parse_diff_color_slot(const char *var, int ofs)
49 {
50 if (!strcasecmp(var+ofs, "plain"))
51 return DIFF_PLAIN;
52 if (!strcasecmp(var+ofs, "meta"))
53 return DIFF_METAINFO;
54 if (!strcasecmp(var+ofs, "frag"))
55 return DIFF_FRAGINFO;
56 if (!strcasecmp(var+ofs, "old"))
57 return DIFF_FILE_OLD;
58 if (!strcasecmp(var+ofs, "new"))
59 return DIFF_FILE_NEW;
60 if (!strcasecmp(var+ofs, "commit"))
61 return DIFF_COMMIT;
62 if (!strcasecmp(var+ofs, "whitespace"))
63 return DIFF_WHITESPACE;
64 if (!strcasecmp(var+ofs, "func"))
65 return DIFF_FUNCINFO;
66 return -1;
67 }
68
69 static int git_config_rename(const char *var, const char *value)
70 {
71 if (!value)
72 return DIFF_DETECT_RENAME;
73 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
74 return DIFF_DETECT_COPY;
75 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
76 }
77
78 /*
79 * These are to give UI layer defaults.
80 * The core-level commands such as git-diff-files should
81 * never be affected by the setting of diff.renames
82 * the user happens to have in the configuration file.
83 */
84 int git_diff_ui_config(const char *var, const char *value, void *cb)
85 {
86 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
87 diff_use_color_default = git_config_colorbool(var, value, -1);
88 return 0;
89 }
90 if (!strcmp(var, "diff.renames")) {
91 diff_detect_rename_default = git_config_rename(var, value);
92 return 0;
93 }
94 if (!strcmp(var, "diff.autorefreshindex")) {
95 diff_auto_refresh_index = git_config_bool(var, value);
96 return 0;
97 }
98 if (!strcmp(var, "diff.mnemonicprefix")) {
99 diff_mnemonic_prefix = git_config_bool(var, value);
100 return 0;
101 }
102 if (!strcmp(var, "diff.noprefix")) {
103 diff_no_prefix = git_config_bool(var, value);
104 return 0;
105 }
106 if (!strcmp(var, "diff.external"))
107 return git_config_string(&external_diff_cmd_cfg, var, value);
108 if (!strcmp(var, "diff.wordregex"))
109 return git_config_string(&diff_word_regex_cfg, var, value);
110
111 if (!strcmp(var, "diff.ignoresubmodules"))
112 handle_ignore_submodules_arg(&default_diff_options, value);
113
114 return git_diff_basic_config(var, value, cb);
115 }
116
117 int git_diff_basic_config(const char *var, const char *value, void *cb)
118 {
119 if (!strcmp(var, "diff.renamelimit")) {
120 diff_rename_limit_default = git_config_int(var, value);
121 return 0;
122 }
123
124 switch (userdiff_config(var, value)) {
125 case 0: break;
126 case -1: return -1;
127 default: return 0;
128 }
129
130 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
131 int slot = parse_diff_color_slot(var, 11);
132 if (slot < 0)
133 return 0;
134 if (!value)
135 return config_error_nonbool(var);
136 color_parse(value, var, diff_colors[slot]);
137 return 0;
138 }
139
140 /* like GNU diff's --suppress-blank-empty option */
141 if (!strcmp(var, "diff.suppressblankempty") ||
142 /* for backwards compatibility */
143 !strcmp(var, "diff.suppress-blank-empty")) {
144 diff_suppress_blank_empty = git_config_bool(var, value);
145 return 0;
146 }
147
148 if (!prefixcmp(var, "submodule."))
149 return parse_submodule_config_option(var, value);
150
151 return git_color_default_config(var, value, cb);
152 }
153
154 static char *quote_two(const char *one, const char *two)
155 {
156 int need_one = quote_c_style(one, NULL, NULL, 1);
157 int need_two = quote_c_style(two, NULL, NULL, 1);
158 struct strbuf res = STRBUF_INIT;
159
160 if (need_one + need_two) {
161 strbuf_addch(&res, '"');
162 quote_c_style(one, &res, NULL, 1);
163 quote_c_style(two, &res, NULL, 1);
164 strbuf_addch(&res, '"');
165 } else {
166 strbuf_addstr(&res, one);
167 strbuf_addstr(&res, two);
168 }
169 return strbuf_detach(&res, NULL);
170 }
171
172 static const char *external_diff(void)
173 {
174 static const char *external_diff_cmd = NULL;
175 static int done_preparing = 0;
176
177 if (done_preparing)
178 return external_diff_cmd;
179 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
180 if (!external_diff_cmd)
181 external_diff_cmd = external_diff_cmd_cfg;
182 done_preparing = 1;
183 return external_diff_cmd;
184 }
185
186 static struct diff_tempfile {
187 const char *name; /* filename external diff should read from */
188 char hex[41];
189 char mode[10];
190 char tmp_path[PATH_MAX];
191 } diff_temp[2];
192
193 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
194
195 struct emit_callback {
196 int color_diff;
197 unsigned ws_rule;
198 int blank_at_eof_in_preimage;
199 int blank_at_eof_in_postimage;
200 int lno_in_preimage;
201 int lno_in_postimage;
202 sane_truncate_fn truncate;
203 const char **label_path;
204 struct diff_words_data *diff_words;
205 struct diff_options *opt;
206 int *found_changesp;
207 struct strbuf *header;
208 };
209
210 static int count_lines(const char *data, int size)
211 {
212 int count, ch, completely_empty = 1, nl_just_seen = 0;
213 count = 0;
214 while (0 < size--) {
215 ch = *data++;
216 if (ch == '\n') {
217 count++;
218 nl_just_seen = 1;
219 completely_empty = 0;
220 }
221 else {
222 nl_just_seen = 0;
223 completely_empty = 0;
224 }
225 }
226 if (completely_empty)
227 return 0;
228 if (!nl_just_seen)
229 count++; /* no trailing newline */
230 return count;
231 }
232
233 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
234 {
235 if (!DIFF_FILE_VALID(one)) {
236 mf->ptr = (char *)""; /* does not matter */
237 mf->size = 0;
238 return 0;
239 }
240 else if (diff_populate_filespec(one, 0))
241 return -1;
242
243 mf->ptr = one->data;
244 mf->size = one->size;
245 return 0;
246 }
247
248 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
249 static unsigned long diff_filespec_size(struct diff_filespec *one)
250 {
251 if (!DIFF_FILE_VALID(one))
252 return 0;
253 diff_populate_filespec(one, 1);
254 return one->size;
255 }
256
257 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
258 {
259 char *ptr = mf->ptr;
260 long size = mf->size;
261 int cnt = 0;
262
263 if (!size)
264 return cnt;
265 ptr += size - 1; /* pointing at the very end */
266 if (*ptr != '\n')
267 ; /* incomplete line */
268 else
269 ptr--; /* skip the last LF */
270 while (mf->ptr < ptr) {
271 char *prev_eol;
272 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
273 if (*prev_eol == '\n')
274 break;
275 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
276 break;
277 cnt++;
278 ptr = prev_eol - 1;
279 }
280 return cnt;
281 }
282
283 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
284 struct emit_callback *ecbdata)
285 {
286 int l1, l2, at;
287 unsigned ws_rule = ecbdata->ws_rule;
288 l1 = count_trailing_blank(mf1, ws_rule);
289 l2 = count_trailing_blank(mf2, ws_rule);
290 if (l2 <= l1) {
291 ecbdata->blank_at_eof_in_preimage = 0;
292 ecbdata->blank_at_eof_in_postimage = 0;
293 return;
294 }
295 at = count_lines(mf1->ptr, mf1->size);
296 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
297
298 at = count_lines(mf2->ptr, mf2->size);
299 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
300 }
301
302 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
303 int first, const char *line, int len)
304 {
305 int has_trailing_newline, has_trailing_carriage_return;
306 int nofirst;
307 FILE *file = o->file;
308
309 if (o->output_prefix) {
310 struct strbuf *msg = NULL;
311 msg = o->output_prefix(o, o->output_prefix_data);
312 assert(msg);
313 fwrite(msg->buf, msg->len, 1, file);
314 }
315
316 if (len == 0) {
317 has_trailing_newline = (first == '\n');
318 has_trailing_carriage_return = (!has_trailing_newline &&
319 (first == '\r'));
320 nofirst = has_trailing_newline || has_trailing_carriage_return;
321 } else {
322 has_trailing_newline = (len > 0 && line[len-1] == '\n');
323 if (has_trailing_newline)
324 len--;
325 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
326 if (has_trailing_carriage_return)
327 len--;
328 nofirst = 0;
329 }
330
331 if (len || !nofirst) {
332 fputs(set, file);
333 if (!nofirst)
334 fputc(first, file);
335 fwrite(line, len, 1, file);
336 fputs(reset, file);
337 }
338 if (has_trailing_carriage_return)
339 fputc('\r', file);
340 if (has_trailing_newline)
341 fputc('\n', file);
342 }
343
344 static void emit_line(struct diff_options *o, const char *set, const char *reset,
345 const char *line, int len)
346 {
347 emit_line_0(o, set, reset, line[0], line+1, len-1);
348 }
349
350 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
351 {
352 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
353 ecbdata->blank_at_eof_in_preimage &&
354 ecbdata->blank_at_eof_in_postimage &&
355 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
356 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
357 return 0;
358 return ws_blank_line(line, len, ecbdata->ws_rule);
359 }
360
361 static void emit_add_line(const char *reset,
362 struct emit_callback *ecbdata,
363 const char *line, int len)
364 {
365 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
366 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
367
368 if (!*ws)
369 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
370 else if (new_blank_line_at_eof(ecbdata, line, len))
371 /* Blank line at EOF - paint '+' as well */
372 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
373 else {
374 /* Emit just the prefix, then the rest. */
375 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
376 ws_check_emit(line, len, ecbdata->ws_rule,
377 ecbdata->opt->file, set, reset, ws);
378 }
379 }
380
381 static void emit_hunk_header(struct emit_callback *ecbdata,
382 const char *line, int len)
383 {
384 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
385 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
386 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
387 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
388 static const char atat[2] = { '@', '@' };
389 const char *cp, *ep;
390 struct strbuf msgbuf = STRBUF_INIT;
391 int org_len = len;
392 int i = 1;
393
394 /*
395 * As a hunk header must begin with "@@ -<old>, +<new> @@",
396 * it always is at least 10 bytes long.
397 */
398 if (len < 10 ||
399 memcmp(line, atat, 2) ||
400 !(ep = memmem(line + 2, len - 2, atat, 2))) {
401 emit_line(ecbdata->opt, plain, reset, line, len);
402 return;
403 }
404 ep += 2; /* skip over @@ */
405
406 /* The hunk header in fraginfo color */
407 strbuf_add(&msgbuf, frag, strlen(frag));
408 strbuf_add(&msgbuf, line, ep - line);
409 strbuf_add(&msgbuf, reset, strlen(reset));
410
411 /*
412 * trailing "\r\n"
413 */
414 for ( ; i < 3; i++)
415 if (line[len - i] == '\r' || line[len - i] == '\n')
416 len--;
417
418 /* blank before the func header */
419 for (cp = ep; ep - line < len; ep++)
420 if (*ep != ' ' && *ep != '\t')
421 break;
422 if (ep != cp) {
423 strbuf_add(&msgbuf, plain, strlen(plain));
424 strbuf_add(&msgbuf, cp, ep - cp);
425 strbuf_add(&msgbuf, reset, strlen(reset));
426 }
427
428 if (ep < line + len) {
429 strbuf_add(&msgbuf, func, strlen(func));
430 strbuf_add(&msgbuf, ep, line + len - ep);
431 strbuf_add(&msgbuf, reset, strlen(reset));
432 }
433
434 strbuf_add(&msgbuf, line + len, org_len - len);
435 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
436 strbuf_release(&msgbuf);
437 }
438
439 static struct diff_tempfile *claim_diff_tempfile(void) {
440 int i;
441 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
442 if (!diff_temp[i].name)
443 return diff_temp + i;
444 die("BUG: diff is failing to clean up its tempfiles");
445 }
446
447 static int remove_tempfile_installed;
448
449 static void remove_tempfile(void)
450 {
451 int i;
452 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
453 if (diff_temp[i].name == diff_temp[i].tmp_path)
454 unlink_or_warn(diff_temp[i].name);
455 diff_temp[i].name = NULL;
456 }
457 }
458
459 static void remove_tempfile_on_signal(int signo)
460 {
461 remove_tempfile();
462 sigchain_pop(signo);
463 raise(signo);
464 }
465
466 static void print_line_count(FILE *file, int count)
467 {
468 switch (count) {
469 case 0:
470 fprintf(file, "0,0");
471 break;
472 case 1:
473 fprintf(file, "1");
474 break;
475 default:
476 fprintf(file, "1,%d", count);
477 break;
478 }
479 }
480
481 static void emit_rewrite_lines(struct emit_callback *ecb,
482 int prefix, const char *data, int size)
483 {
484 const char *endp = NULL;
485 static const char *nneof = " No newline at end of file\n";
486 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
487 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
488
489 while (0 < size) {
490 int len;
491
492 endp = memchr(data, '\n', size);
493 len = endp ? (endp - data + 1) : size;
494 if (prefix != '+') {
495 ecb->lno_in_preimage++;
496 emit_line_0(ecb->opt, old, reset, '-',
497 data, len);
498 } else {
499 ecb->lno_in_postimage++;
500 emit_add_line(reset, ecb, data, len);
501 }
502 size -= len;
503 data += len;
504 }
505 if (!endp) {
506 const char *plain = diff_get_color(ecb->color_diff,
507 DIFF_PLAIN);
508 emit_line_0(ecb->opt, plain, reset, '\\',
509 nneof, strlen(nneof));
510 }
511 }
512
513 static void emit_rewrite_diff(const char *name_a,
514 const char *name_b,
515 struct diff_filespec *one,
516 struct diff_filespec *two,
517 struct userdiff_driver *textconv_one,
518 struct userdiff_driver *textconv_two,
519 struct diff_options *o)
520 {
521 int lc_a, lc_b;
522 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
523 const char *name_a_tab, *name_b_tab;
524 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
525 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
526 const char *reset = diff_get_color(color_diff, DIFF_RESET);
527 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
528 const char *a_prefix, *b_prefix;
529 char *data_one, *data_two;
530 size_t size_one, size_two;
531 struct emit_callback ecbdata;
532 char *line_prefix = "";
533 struct strbuf *msgbuf;
534
535 if (o && o->output_prefix) {
536 msgbuf = o->output_prefix(o, o->output_prefix_data);
537 line_prefix = msgbuf->buf;
538 }
539
540 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
541 a_prefix = o->b_prefix;
542 b_prefix = o->a_prefix;
543 } else {
544 a_prefix = o->a_prefix;
545 b_prefix = o->b_prefix;
546 }
547
548 name_a += (*name_a == '/');
549 name_b += (*name_b == '/');
550 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
551 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
552
553 strbuf_reset(&a_name);
554 strbuf_reset(&b_name);
555 quote_two_c_style(&a_name, a_prefix, name_a, 0);
556 quote_two_c_style(&b_name, b_prefix, name_b, 0);
557
558 size_one = fill_textconv(textconv_one, one, &data_one);
559 size_two = fill_textconv(textconv_two, two, &data_two);
560
561 memset(&ecbdata, 0, sizeof(ecbdata));
562 ecbdata.color_diff = color_diff;
563 ecbdata.found_changesp = &o->found_changes;
564 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
565 ecbdata.opt = o;
566 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
567 mmfile_t mf1, mf2;
568 mf1.ptr = (char *)data_one;
569 mf2.ptr = (char *)data_two;
570 mf1.size = size_one;
571 mf2.size = size_two;
572 check_blank_at_eof(&mf1, &mf2, &ecbdata);
573 }
574 ecbdata.lno_in_preimage = 1;
575 ecbdata.lno_in_postimage = 1;
576
577 lc_a = count_lines(data_one, size_one);
578 lc_b = count_lines(data_two, size_two);
579 fprintf(o->file,
580 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
581 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
582 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
583 line_prefix, fraginfo);
584 print_line_count(o->file, lc_a);
585 fprintf(o->file, " +");
586 print_line_count(o->file, lc_b);
587 fprintf(o->file, " @@%s\n", reset);
588 if (lc_a)
589 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
590 if (lc_b)
591 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
592 if (textconv_one)
593 free((char *)data_one);
594 if (textconv_two)
595 free((char *)data_two);
596 }
597
598 struct diff_words_buffer {
599 mmfile_t text;
600 long alloc;
601 struct diff_words_orig {
602 const char *begin, *end;
603 } *orig;
604 int orig_nr, orig_alloc;
605 };
606
607 static void diff_words_append(char *line, unsigned long len,
608 struct diff_words_buffer *buffer)
609 {
610 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
611 line++;
612 len--;
613 memcpy(buffer->text.ptr + buffer->text.size, line, len);
614 buffer->text.size += len;
615 buffer->text.ptr[buffer->text.size] = '\0';
616 }
617
618 struct diff_words_style_elem {
619 const char *prefix;
620 const char *suffix;
621 const char *color; /* NULL; filled in by the setup code if
622 * color is enabled */
623 };
624
625 struct diff_words_style {
626 enum diff_words_type type;
627 struct diff_words_style_elem new, old, ctx;
628 const char *newline;
629 };
630
631 static struct diff_words_style diff_words_styles[] = {
632 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
633 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
634 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
635 };
636
637 struct diff_words_data {
638 struct diff_words_buffer minus, plus;
639 const char *current_plus;
640 int last_minus;
641 struct diff_options *opt;
642 regex_t *word_regex;
643 enum diff_words_type type;
644 struct diff_words_style *style;
645 };
646
647 static int fn_out_diff_words_write_helper(FILE *fp,
648 struct diff_words_style_elem *st_el,
649 const char *newline,
650 size_t count, const char *buf,
651 const char *line_prefix)
652 {
653 int print = 0;
654
655 while (count) {
656 char *p = memchr(buf, '\n', count);
657 if (print)
658 fputs(line_prefix, fp);
659 if (p != buf) {
660 if (st_el->color && fputs(st_el->color, fp) < 0)
661 return -1;
662 if (fputs(st_el->prefix, fp) < 0 ||
663 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
664 fputs(st_el->suffix, fp) < 0)
665 return -1;
666 if (st_el->color && *st_el->color
667 && fputs(GIT_COLOR_RESET, fp) < 0)
668 return -1;
669 }
670 if (!p)
671 return 0;
672 if (fputs(newline, fp) < 0)
673 return -1;
674 count -= p + 1 - buf;
675 buf = p + 1;
676 print = 1;
677 }
678 return 0;
679 }
680
681 /*
682 * '--color-words' algorithm can be described as:
683 *
684 * 1. collect a the minus/plus lines of a diff hunk, divided into
685 * minus-lines and plus-lines;
686 *
687 * 2. break both minus-lines and plus-lines into words and
688 * place them into two mmfile_t with one word for each line;
689 *
690 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
691 *
692 * And for the common parts of the both file, we output the plus side text.
693 * diff_words->current_plus is used to trace the current position of the plus file
694 * which printed. diff_words->last_minus is used to trace the last minus word
695 * printed.
696 *
697 * For '--graph' to work with '--color-words', we need to output the graph prefix
698 * on each line of color words output. Generally, there are two conditions on
699 * which we should output the prefix.
700 *
701 * 1. diff_words->last_minus == 0 &&
702 * diff_words->current_plus == diff_words->plus.text.ptr
703 *
704 * that is: the plus text must start as a new line, and if there is no minus
705 * word printed, a graph prefix must be printed.
706 *
707 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
708 * *(diff_words->current_plus - 1) == '\n'
709 *
710 * that is: a graph prefix must be printed following a '\n'
711 */
712 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
713 {
714 if ((diff_words->last_minus == 0 &&
715 diff_words->current_plus == diff_words->plus.text.ptr) ||
716 (diff_words->current_plus > diff_words->plus.text.ptr &&
717 *(diff_words->current_plus - 1) == '\n')) {
718 return 1;
719 } else {
720 return 0;
721 }
722 }
723
724 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
725 {
726 struct diff_words_data *diff_words = priv;
727 struct diff_words_style *style = diff_words->style;
728 int minus_first, minus_len, plus_first, plus_len;
729 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
730 struct diff_options *opt = diff_words->opt;
731 struct strbuf *msgbuf;
732 char *line_prefix = "";
733
734 if (line[0] != '@' || parse_hunk_header(line, len,
735 &minus_first, &minus_len, &plus_first, &plus_len))
736 return;
737
738 assert(opt);
739 if (opt->output_prefix) {
740 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
741 line_prefix = msgbuf->buf;
742 }
743
744 /* POSIX requires that first be decremented by one if len == 0... */
745 if (minus_len) {
746 minus_begin = diff_words->minus.orig[minus_first].begin;
747 minus_end =
748 diff_words->minus.orig[minus_first + minus_len - 1].end;
749 } else
750 minus_begin = minus_end =
751 diff_words->minus.orig[minus_first].end;
752
753 if (plus_len) {
754 plus_begin = diff_words->plus.orig[plus_first].begin;
755 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
756 } else
757 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
758
759 if (color_words_output_graph_prefix(diff_words)) {
760 fputs(line_prefix, diff_words->opt->file);
761 }
762 if (diff_words->current_plus != plus_begin) {
763 fn_out_diff_words_write_helper(diff_words->opt->file,
764 &style->ctx, style->newline,
765 plus_begin - diff_words->current_plus,
766 diff_words->current_plus, line_prefix);
767 if (*(plus_begin - 1) == '\n')
768 fputs(line_prefix, diff_words->opt->file);
769 }
770 if (minus_begin != minus_end) {
771 fn_out_diff_words_write_helper(diff_words->opt->file,
772 &style->old, style->newline,
773 minus_end - minus_begin, minus_begin,
774 line_prefix);
775 }
776 if (plus_begin != plus_end) {
777 fn_out_diff_words_write_helper(diff_words->opt->file,
778 &style->new, style->newline,
779 plus_end - plus_begin, plus_begin,
780 line_prefix);
781 }
782
783 diff_words->current_plus = plus_end;
784 diff_words->last_minus = minus_first;
785 }
786
787 /* This function starts looking at *begin, and returns 0 iff a word was found. */
788 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
789 int *begin, int *end)
790 {
791 if (word_regex && *begin < buffer->size) {
792 regmatch_t match[1];
793 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
794 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
795 '\n', match[0].rm_eo - match[0].rm_so);
796 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
797 *begin += match[0].rm_so;
798 return *begin >= *end;
799 }
800 return -1;
801 }
802
803 /* find the next word */
804 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
805 (*begin)++;
806 if (*begin >= buffer->size)
807 return -1;
808
809 /* find the end of the word */
810 *end = *begin + 1;
811 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
812 (*end)++;
813
814 return 0;
815 }
816
817 /*
818 * This function splits the words in buffer->text, stores the list with
819 * newline separator into out, and saves the offsets of the original words
820 * in buffer->orig.
821 */
822 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
823 regex_t *word_regex)
824 {
825 int i, j;
826 long alloc = 0;
827
828 out->size = 0;
829 out->ptr = NULL;
830
831 /* fake an empty "0th" word */
832 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
833 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
834 buffer->orig_nr = 1;
835
836 for (i = 0; i < buffer->text.size; i++) {
837 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
838 return;
839
840 /* store original boundaries */
841 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
842 buffer->orig_alloc);
843 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
844 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
845 buffer->orig_nr++;
846
847 /* store one word */
848 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
849 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
850 out->ptr[out->size + j - i] = '\n';
851 out->size += j - i + 1;
852
853 i = j - 1;
854 }
855 }
856
857 /* this executes the word diff on the accumulated buffers */
858 static void diff_words_show(struct diff_words_data *diff_words)
859 {
860 xpparam_t xpp;
861 xdemitconf_t xecfg;
862 mmfile_t minus, plus;
863 struct diff_words_style *style = diff_words->style;
864
865 struct diff_options *opt = diff_words->opt;
866 struct strbuf *msgbuf;
867 char *line_prefix = "";
868
869 assert(opt);
870 if (opt->output_prefix) {
871 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
872 line_prefix = msgbuf->buf;
873 }
874
875 /* special case: only removal */
876 if (!diff_words->plus.text.size) {
877 fputs(line_prefix, diff_words->opt->file);
878 fn_out_diff_words_write_helper(diff_words->opt->file,
879 &style->old, style->newline,
880 diff_words->minus.text.size,
881 diff_words->minus.text.ptr, line_prefix);
882 diff_words->minus.text.size = 0;
883 return;
884 }
885
886 diff_words->current_plus = diff_words->plus.text.ptr;
887 diff_words->last_minus = 0;
888
889 memset(&xpp, 0, sizeof(xpp));
890 memset(&xecfg, 0, sizeof(xecfg));
891 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
892 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
893 xpp.flags = 0;
894 /* as only the hunk header will be parsed, we need a 0-context */
895 xecfg.ctxlen = 0;
896 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
897 &xpp, &xecfg);
898 free(minus.ptr);
899 free(plus.ptr);
900 if (diff_words->current_plus != diff_words->plus.text.ptr +
901 diff_words->plus.text.size) {
902 if (color_words_output_graph_prefix(diff_words))
903 fputs(line_prefix, diff_words->opt->file);
904 fn_out_diff_words_write_helper(diff_words->opt->file,
905 &style->ctx, style->newline,
906 diff_words->plus.text.ptr + diff_words->plus.text.size
907 - diff_words->current_plus, diff_words->current_plus,
908 line_prefix);
909 }
910 diff_words->minus.text.size = diff_words->plus.text.size = 0;
911 }
912
913 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
914 static void diff_words_flush(struct emit_callback *ecbdata)
915 {
916 if (ecbdata->diff_words->minus.text.size ||
917 ecbdata->diff_words->plus.text.size)
918 diff_words_show(ecbdata->diff_words);
919 }
920
921 static void free_diff_words_data(struct emit_callback *ecbdata)
922 {
923 if (ecbdata->diff_words) {
924 diff_words_flush(ecbdata);
925 free (ecbdata->diff_words->minus.text.ptr);
926 free (ecbdata->diff_words->minus.orig);
927 free (ecbdata->diff_words->plus.text.ptr);
928 free (ecbdata->diff_words->plus.orig);
929 if (ecbdata->diff_words->word_regex) {
930 regfree(ecbdata->diff_words->word_regex);
931 free(ecbdata->diff_words->word_regex);
932 }
933 free(ecbdata->diff_words);
934 ecbdata->diff_words = NULL;
935 }
936 }
937
938 const char *diff_get_color(int diff_use_color, enum color_diff ix)
939 {
940 if (diff_use_color)
941 return diff_colors[ix];
942 return "";
943 }
944
945 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
946 {
947 const char *cp;
948 unsigned long allot;
949 size_t l = len;
950
951 if (ecb->truncate)
952 return ecb->truncate(line, len);
953 cp = line;
954 allot = l;
955 while (0 < l) {
956 (void) utf8_width(&cp, &l);
957 if (!cp)
958 break; /* truncated in the middle? */
959 }
960 return allot - l;
961 }
962
963 static void find_lno(const char *line, struct emit_callback *ecbdata)
964 {
965 const char *p;
966 ecbdata->lno_in_preimage = 0;
967 ecbdata->lno_in_postimage = 0;
968 p = strchr(line, '-');
969 if (!p)
970 return; /* cannot happen */
971 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
972 p = strchr(p, '+');
973 if (!p)
974 return; /* cannot happen */
975 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
976 }
977
978 static void fn_out_consume(void *priv, char *line, unsigned long len)
979 {
980 struct emit_callback *ecbdata = priv;
981 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
982 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
983 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
984 struct diff_options *o = ecbdata->opt;
985 char *line_prefix = "";
986 struct strbuf *msgbuf;
987
988 if (o && o->output_prefix) {
989 msgbuf = o->output_prefix(o, o->output_prefix_data);
990 line_prefix = msgbuf->buf;
991 }
992
993 if (ecbdata->header) {
994 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
995 strbuf_reset(ecbdata->header);
996 ecbdata->header = NULL;
997 }
998 *(ecbdata->found_changesp) = 1;
999
1000 if (ecbdata->label_path[0]) {
1001 const char *name_a_tab, *name_b_tab;
1002
1003 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1004 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1005
1006 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1007 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1008 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1009 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1010 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1011 }
1012
1013 if (diff_suppress_blank_empty
1014 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1015 line[0] = '\n';
1016 len = 1;
1017 }
1018
1019 if (line[0] == '@') {
1020 if (ecbdata->diff_words)
1021 diff_words_flush(ecbdata);
1022 len = sane_truncate_line(ecbdata, line, len);
1023 find_lno(line, ecbdata);
1024 emit_hunk_header(ecbdata, line, len);
1025 if (line[len-1] != '\n')
1026 putc('\n', ecbdata->opt->file);
1027 return;
1028 }
1029
1030 if (len < 1) {
1031 emit_line(ecbdata->opt, reset, reset, line, len);
1032 if (ecbdata->diff_words
1033 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1034 fputs("~\n", ecbdata->opt->file);
1035 return;
1036 }
1037
1038 if (ecbdata->diff_words) {
1039 if (line[0] == '-') {
1040 diff_words_append(line, len,
1041 &ecbdata->diff_words->minus);
1042 return;
1043 } else if (line[0] == '+') {
1044 diff_words_append(line, len,
1045 &ecbdata->diff_words->plus);
1046 return;
1047 }
1048 diff_words_flush(ecbdata);
1049 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1050 emit_line(ecbdata->opt, plain, reset, line, len);
1051 fputs("~\n", ecbdata->opt->file);
1052 } else {
1053 /* don't print the prefix character */
1054 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
1055 }
1056 return;
1057 }
1058
1059 if (line[0] != '+') {
1060 const char *color =
1061 diff_get_color(ecbdata->color_diff,
1062 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1063 ecbdata->lno_in_preimage++;
1064 if (line[0] == ' ')
1065 ecbdata->lno_in_postimage++;
1066 emit_line(ecbdata->opt, color, reset, line, len);
1067 } else {
1068 ecbdata->lno_in_postimage++;
1069 emit_add_line(reset, ecbdata, line + 1, len - 1);
1070 }
1071 }
1072
1073 static char *pprint_rename(const char *a, const char *b)
1074 {
1075 const char *old = a;
1076 const char *new = b;
1077 struct strbuf name = STRBUF_INIT;
1078 int pfx_length, sfx_length;
1079 int len_a = strlen(a);
1080 int len_b = strlen(b);
1081 int a_midlen, b_midlen;
1082 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1083 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1084
1085 if (qlen_a || qlen_b) {
1086 quote_c_style(a, &name, NULL, 0);
1087 strbuf_addstr(&name, " => ");
1088 quote_c_style(b, &name, NULL, 0);
1089 return strbuf_detach(&name, NULL);
1090 }
1091
1092 /* Find common prefix */
1093 pfx_length = 0;
1094 while (*old && *new && *old == *new) {
1095 if (*old == '/')
1096 pfx_length = old - a + 1;
1097 old++;
1098 new++;
1099 }
1100
1101 /* Find common suffix */
1102 old = a + len_a;
1103 new = b + len_b;
1104 sfx_length = 0;
1105 while (a <= old && b <= new && *old == *new) {
1106 if (*old == '/')
1107 sfx_length = len_a - (old - a);
1108 old--;
1109 new--;
1110 }
1111
1112 /*
1113 * pfx{mid-a => mid-b}sfx
1114 * {pfx-a => pfx-b}sfx
1115 * pfx{sfx-a => sfx-b}
1116 * name-a => name-b
1117 */
1118 a_midlen = len_a - pfx_length - sfx_length;
1119 b_midlen = len_b - pfx_length - sfx_length;
1120 if (a_midlen < 0)
1121 a_midlen = 0;
1122 if (b_midlen < 0)
1123 b_midlen = 0;
1124
1125 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1126 if (pfx_length + sfx_length) {
1127 strbuf_add(&name, a, pfx_length);
1128 strbuf_addch(&name, '{');
1129 }
1130 strbuf_add(&name, a + pfx_length, a_midlen);
1131 strbuf_addstr(&name, " => ");
1132 strbuf_add(&name, b + pfx_length, b_midlen);
1133 if (pfx_length + sfx_length) {
1134 strbuf_addch(&name, '}');
1135 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1136 }
1137 return strbuf_detach(&name, NULL);
1138 }
1139
1140 struct diffstat_t {
1141 int nr;
1142 int alloc;
1143 struct diffstat_file {
1144 char *from_name;
1145 char *name;
1146 char *print_name;
1147 unsigned is_unmerged:1;
1148 unsigned is_binary:1;
1149 unsigned is_renamed:1;
1150 uintmax_t added, deleted;
1151 } **files;
1152 };
1153
1154 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1155 const char *name_a,
1156 const char *name_b)
1157 {
1158 struct diffstat_file *x;
1159 x = xcalloc(sizeof (*x), 1);
1160 if (diffstat->nr == diffstat->alloc) {
1161 diffstat->alloc = alloc_nr(diffstat->alloc);
1162 diffstat->files = xrealloc(diffstat->files,
1163 diffstat->alloc * sizeof(x));
1164 }
1165 diffstat->files[diffstat->nr++] = x;
1166 if (name_b) {
1167 x->from_name = xstrdup(name_a);
1168 x->name = xstrdup(name_b);
1169 x->is_renamed = 1;
1170 }
1171 else {
1172 x->from_name = NULL;
1173 x->name = xstrdup(name_a);
1174 }
1175 return x;
1176 }
1177
1178 static void diffstat_consume(void *priv, char *line, unsigned long len)
1179 {
1180 struct diffstat_t *diffstat = priv;
1181 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1182
1183 if (line[0] == '+')
1184 x->added++;
1185 else if (line[0] == '-')
1186 x->deleted++;
1187 }
1188
1189 const char mime_boundary_leader[] = "------------";
1190
1191 static int scale_linear(int it, int width, int max_change)
1192 {
1193 /*
1194 * make sure that at least one '-' is printed if there were deletions,
1195 * and likewise for '+'.
1196 */
1197 if (max_change < 2)
1198 return it;
1199 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1200 }
1201
1202 static void show_name(FILE *file,
1203 const char *prefix, const char *name, int len)
1204 {
1205 fprintf(file, " %s%-*s |", prefix, len, name);
1206 }
1207
1208 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1209 {
1210 if (cnt <= 0)
1211 return;
1212 fprintf(file, "%s", set);
1213 while (cnt--)
1214 putc(ch, file);
1215 fprintf(file, "%s", reset);
1216 }
1217
1218 static void fill_print_name(struct diffstat_file *file)
1219 {
1220 char *pname;
1221
1222 if (file->print_name)
1223 return;
1224
1225 if (!file->is_renamed) {
1226 struct strbuf buf = STRBUF_INIT;
1227 if (quote_c_style(file->name, &buf, NULL, 0)) {
1228 pname = strbuf_detach(&buf, NULL);
1229 } else {
1230 pname = file->name;
1231 strbuf_release(&buf);
1232 }
1233 } else {
1234 pname = pprint_rename(file->from_name, file->name);
1235 }
1236 file->print_name = pname;
1237 }
1238
1239 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1240 {
1241 int i, len, add, del, adds = 0, dels = 0;
1242 uintmax_t max_change = 0, max_len = 0;
1243 int total_files = data->nr;
1244 int width, name_width;
1245 const char *reset, *add_c, *del_c;
1246 const char *line_prefix = "";
1247 struct strbuf *msg = NULL;
1248
1249 if (data->nr == 0)
1250 return;
1251
1252 if (options->output_prefix) {
1253 msg = options->output_prefix(options, options->output_prefix_data);
1254 line_prefix = msg->buf;
1255 }
1256
1257 width = options->stat_width ? options->stat_width : 80;
1258 name_width = options->stat_name_width ? options->stat_name_width : 50;
1259
1260 /* Sanity: give at least 5 columns to the graph,
1261 * but leave at least 10 columns for the name.
1262 */
1263 if (width < 25)
1264 width = 25;
1265 if (name_width < 10)
1266 name_width = 10;
1267 else if (width < name_width + 15)
1268 name_width = width - 15;
1269
1270 /* Find the longest filename and max number of changes */
1271 reset = diff_get_color_opt(options, DIFF_RESET);
1272 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1273 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1274
1275 for (i = 0; i < data->nr; i++) {
1276 struct diffstat_file *file = data->files[i];
1277 uintmax_t change = file->added + file->deleted;
1278 fill_print_name(file);
1279 len = strlen(file->print_name);
1280 if (max_len < len)
1281 max_len = len;
1282
1283 if (file->is_binary || file->is_unmerged)
1284 continue;
1285 if (max_change < change)
1286 max_change = change;
1287 }
1288
1289 /* Compute the width of the graph part;
1290 * 10 is for one blank at the beginning of the line plus
1291 * " | count " between the name and the graph.
1292 *
1293 * From here on, name_width is the width of the name area,
1294 * and width is the width of the graph area.
1295 */
1296 name_width = (name_width < max_len) ? name_width : max_len;
1297 if (width < (name_width + 10) + max_change)
1298 width = width - (name_width + 10);
1299 else
1300 width = max_change;
1301
1302 for (i = 0; i < data->nr; i++) {
1303 const char *prefix = "";
1304 char *name = data->files[i]->print_name;
1305 uintmax_t added = data->files[i]->added;
1306 uintmax_t deleted = data->files[i]->deleted;
1307 int name_len;
1308
1309 /*
1310 * "scale" the filename
1311 */
1312 len = name_width;
1313 name_len = strlen(name);
1314 if (name_width < name_len) {
1315 char *slash;
1316 prefix = "...";
1317 len -= 3;
1318 name += name_len - len;
1319 slash = strchr(name, '/');
1320 if (slash)
1321 name = slash;
1322 }
1323
1324 if (data->files[i]->is_binary) {
1325 fprintf(options->file, "%s", line_prefix);
1326 show_name(options->file, prefix, name, len);
1327 fprintf(options->file, " Bin ");
1328 fprintf(options->file, "%s%"PRIuMAX"%s",
1329 del_c, deleted, reset);
1330 fprintf(options->file, " -> ");
1331 fprintf(options->file, "%s%"PRIuMAX"%s",
1332 add_c, added, reset);
1333 fprintf(options->file, " bytes");
1334 fprintf(options->file, "\n");
1335 continue;
1336 }
1337 else if (data->files[i]->is_unmerged) {
1338 fprintf(options->file, "%s", line_prefix);
1339 show_name(options->file, prefix, name, len);
1340 fprintf(options->file, " Unmerged\n");
1341 continue;
1342 }
1343 else if (!data->files[i]->is_renamed &&
1344 (added + deleted == 0)) {
1345 total_files--;
1346 continue;
1347 }
1348
1349 /*
1350 * scale the add/delete
1351 */
1352 add = added;
1353 del = deleted;
1354 adds += add;
1355 dels += del;
1356
1357 if (width <= max_change) {
1358 add = scale_linear(add, width, max_change);
1359 del = scale_linear(del, width, max_change);
1360 }
1361 fprintf(options->file, "%s", line_prefix);
1362 show_name(options->file, prefix, name, len);
1363 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1364 added + deleted ? " " : "");
1365 show_graph(options->file, '+', add, add_c, reset);
1366 show_graph(options->file, '-', del, del_c, reset);
1367 fprintf(options->file, "\n");
1368 }
1369 fprintf(options->file, "%s", line_prefix);
1370 fprintf(options->file,
1371 " %d files changed, %d insertions(+), %d deletions(-)\n",
1372 total_files, adds, dels);
1373 }
1374
1375 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1376 {
1377 int i, adds = 0, dels = 0, total_files = data->nr;
1378
1379 if (data->nr == 0)
1380 return;
1381
1382 for (i = 0; i < data->nr; i++) {
1383 if (!data->files[i]->is_binary &&
1384 !data->files[i]->is_unmerged) {
1385 int added = data->files[i]->added;
1386 int deleted= data->files[i]->deleted;
1387 if (!data->files[i]->is_renamed &&
1388 (added + deleted == 0)) {
1389 total_files--;
1390 } else {
1391 adds += added;
1392 dels += deleted;
1393 }
1394 }
1395 }
1396 if (options->output_prefix) {
1397 struct strbuf *msg = NULL;
1398 msg = options->output_prefix(options,
1399 options->output_prefix_data);
1400 fprintf(options->file, "%s", msg->buf);
1401 }
1402 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1403 total_files, adds, dels);
1404 }
1405
1406 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1407 {
1408 int i;
1409
1410 if (data->nr == 0)
1411 return;
1412
1413 for (i = 0; i < data->nr; i++) {
1414 struct diffstat_file *file = data->files[i];
1415
1416 if (options->output_prefix) {
1417 struct strbuf *msg = NULL;
1418 msg = options->output_prefix(options,
1419 options->output_prefix_data);
1420 fprintf(options->file, "%s", msg->buf);
1421 }
1422
1423 if (file->is_binary)
1424 fprintf(options->file, "-\t-\t");
1425 else
1426 fprintf(options->file,
1427 "%"PRIuMAX"\t%"PRIuMAX"\t",
1428 file->added, file->deleted);
1429 if (options->line_termination) {
1430 fill_print_name(file);
1431 if (!file->is_renamed)
1432 write_name_quoted(file->name, options->file,
1433 options->line_termination);
1434 else {
1435 fputs(file->print_name, options->file);
1436 putc(options->line_termination, options->file);
1437 }
1438 } else {
1439 if (file->is_renamed) {
1440 putc('\0', options->file);
1441 write_name_quoted(file->from_name, options->file, '\0');
1442 }
1443 write_name_quoted(file->name, options->file, '\0');
1444 }
1445 }
1446 }
1447
1448 struct dirstat_file {
1449 const char *name;
1450 unsigned long changed;
1451 };
1452
1453 struct dirstat_dir {
1454 struct dirstat_file *files;
1455 int alloc, nr, percent, cumulative;
1456 };
1457
1458 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1459 unsigned long changed, const char *base, int baselen)
1460 {
1461 unsigned long this_dir = 0;
1462 unsigned int sources = 0;
1463 const char *line_prefix = "";
1464 struct strbuf *msg = NULL;
1465
1466 if (opt->output_prefix) {
1467 msg = opt->output_prefix(opt, opt->output_prefix_data);
1468 line_prefix = msg->buf;
1469 }
1470
1471 while (dir->nr) {
1472 struct dirstat_file *f = dir->files;
1473 int namelen = strlen(f->name);
1474 unsigned long this;
1475 char *slash;
1476
1477 if (namelen < baselen)
1478 break;
1479 if (memcmp(f->name, base, baselen))
1480 break;
1481 slash = strchr(f->name + baselen, '/');
1482 if (slash) {
1483 int newbaselen = slash + 1 - f->name;
1484 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1485 sources++;
1486 } else {
1487 this = f->changed;
1488 dir->files++;
1489 dir->nr--;
1490 sources += 2;
1491 }
1492 this_dir += this;
1493 }
1494
1495 /*
1496 * We don't report dirstat's for
1497 * - the top level
1498 * - or cases where everything came from a single directory
1499 * under this directory (sources == 1).
1500 */
1501 if (baselen && sources != 1) {
1502 int permille = this_dir * 1000 / changed;
1503 if (permille) {
1504 int percent = permille / 10;
1505 if (percent >= dir->percent) {
1506 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1507 percent, permille % 10, baselen, base);
1508 if (!dir->cumulative)
1509 return 0;
1510 }
1511 }
1512 }
1513 return this_dir;
1514 }
1515
1516 static int dirstat_compare(const void *_a, const void *_b)
1517 {
1518 const struct dirstat_file *a = _a;
1519 const struct dirstat_file *b = _b;
1520 return strcmp(a->name, b->name);
1521 }
1522
1523 static void show_dirstat(struct diff_options *options)
1524 {
1525 int i;
1526 unsigned long changed;
1527 struct dirstat_dir dir;
1528 struct diff_queue_struct *q = &diff_queued_diff;
1529
1530 dir.files = NULL;
1531 dir.alloc = 0;
1532 dir.nr = 0;
1533 dir.percent = options->dirstat_percent;
1534 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1535
1536 changed = 0;
1537 for (i = 0; i < q->nr; i++) {
1538 struct diff_filepair *p = q->queue[i];
1539 const char *name;
1540 unsigned long copied, added, damage;
1541 int content_changed;
1542
1543 name = p->two->path ? p->two->path : p->one->path;
1544
1545 if (p->one->sha1_valid && p->two->sha1_valid)
1546 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1547 else
1548 content_changed = 1;
1549
1550 if (!content_changed) {
1551 /*
1552 * The SHA1 has not changed, so pre-/post-content is
1553 * identical. We can therefore skip looking at the
1554 * file contents altogether.
1555 */
1556 damage = 0;
1557 goto found_damage;
1558 }
1559
1560 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1561 /*
1562 * In --dirstat-by-file mode, we don't really need to
1563 * look at the actual file contents at all.
1564 * The fact that the SHA1 changed is enough for us to
1565 * add this file to the list of results
1566 * (with each file contributing equal damage).
1567 */
1568 damage = 1;
1569 goto found_damage;
1570 }
1571
1572 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1573 diff_populate_filespec(p->one, 0);
1574 diff_populate_filespec(p->two, 0);
1575 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1576 &copied, &added);
1577 diff_free_filespec_data(p->one);
1578 diff_free_filespec_data(p->two);
1579 } else if (DIFF_FILE_VALID(p->one)) {
1580 diff_populate_filespec(p->one, 1);
1581 copied = added = 0;
1582 diff_free_filespec_data(p->one);
1583 } else if (DIFF_FILE_VALID(p->two)) {
1584 diff_populate_filespec(p->two, 1);
1585 copied = 0;
1586 added = p->two->size;
1587 diff_free_filespec_data(p->two);
1588 } else
1589 continue;
1590
1591 /*
1592 * Original minus copied is the removed material,
1593 * added is the new material. They are both damages
1594 * made to the preimage.
1595 * If the resulting damage is zero, we know that
1596 * diffcore_count_changes() considers the two entries to
1597 * be identical, but since content_changed is true, we
1598 * know that there must have been _some_ kind of change,
1599 * so we force all entries to have damage > 0.
1600 */
1601 damage = (p->one->size - copied) + added;
1602 if (!damage)
1603 damage = 1;
1604
1605 found_damage:
1606 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1607 dir.files[dir.nr].name = name;
1608 dir.files[dir.nr].changed = damage;
1609 changed += damage;
1610 dir.nr++;
1611 }
1612
1613 /* This can happen even with many files, if everything was renames */
1614 if (!changed)
1615 return;
1616
1617 /* Show all directories with more than x% of the changes */
1618 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1619 gather_dirstat(options, &dir, changed, "", 0);
1620 }
1621
1622 static void free_diffstat_info(struct diffstat_t *diffstat)
1623 {
1624 int i;
1625 for (i = 0; i < diffstat->nr; i++) {
1626 struct diffstat_file *f = diffstat->files[i];
1627 if (f->name != f->print_name)
1628 free(f->print_name);
1629 free(f->name);
1630 free(f->from_name);
1631 free(f);
1632 }
1633 free(diffstat->files);
1634 }
1635
1636 struct checkdiff_t {
1637 const char *filename;
1638 int lineno;
1639 int conflict_marker_size;
1640 struct diff_options *o;
1641 unsigned ws_rule;
1642 unsigned status;
1643 };
1644
1645 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1646 {
1647 char firstchar;
1648 int cnt;
1649
1650 if (len < marker_size + 1)
1651 return 0;
1652 firstchar = line[0];
1653 switch (firstchar) {
1654 case '=': case '>': case '<': case '|':
1655 break;
1656 default:
1657 return 0;
1658 }
1659 for (cnt = 1; cnt < marker_size; cnt++)
1660 if (line[cnt] != firstchar)
1661 return 0;
1662 /* line[1] thru line[marker_size-1] are same as firstchar */
1663 if (len < marker_size + 1 || !isspace(line[marker_size]))
1664 return 0;
1665 return 1;
1666 }
1667
1668 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1669 {
1670 struct checkdiff_t *data = priv;
1671 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1672 int marker_size = data->conflict_marker_size;
1673 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1674 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1675 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1676 char *err;
1677 char *line_prefix = "";
1678 struct strbuf *msgbuf;
1679
1680 assert(data->o);
1681 if (data->o->output_prefix) {
1682 msgbuf = data->o->output_prefix(data->o,
1683 data->o->output_prefix_data);
1684 line_prefix = msgbuf->buf;
1685 }
1686
1687 if (line[0] == '+') {
1688 unsigned bad;
1689 data->lineno++;
1690 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1691 data->status |= 1;
1692 fprintf(data->o->file,
1693 "%s%s:%d: leftover conflict marker\n",
1694 line_prefix, data->filename, data->lineno);
1695 }
1696 bad = ws_check(line + 1, len - 1, data->ws_rule);
1697 if (!bad)
1698 return;
1699 data->status |= bad;
1700 err = whitespace_error_string(bad);
1701 fprintf(data->o->file, "%s%s:%d: %s.\n",
1702 line_prefix, data->filename, data->lineno, err);
1703 free(err);
1704 emit_line(data->o, set, reset, line, 1);
1705 ws_check_emit(line + 1, len - 1, data->ws_rule,
1706 data->o->file, set, reset, ws);
1707 } else if (line[0] == ' ') {
1708 data->lineno++;
1709 } else if (line[0] == '@') {
1710 char *plus = strchr(line, '+');
1711 if (plus)
1712 data->lineno = strtol(plus, NULL, 10) - 1;
1713 else
1714 die("invalid diff");
1715 }
1716 }
1717
1718 static unsigned char *deflate_it(char *data,
1719 unsigned long size,
1720 unsigned long *result_size)
1721 {
1722 int bound;
1723 unsigned char *deflated;
1724 z_stream stream;
1725
1726 memset(&stream, 0, sizeof(stream));
1727 deflateInit(&stream, zlib_compression_level);
1728 bound = deflateBound(&stream, size);
1729 deflated = xmalloc(bound);
1730 stream.next_out = deflated;
1731 stream.avail_out = bound;
1732
1733 stream.next_in = (unsigned char *)data;
1734 stream.avail_in = size;
1735 while (deflate(&stream, Z_FINISH) == Z_OK)
1736 ; /* nothing */
1737 deflateEnd(&stream);
1738 *result_size = stream.total_out;
1739 return deflated;
1740 }
1741
1742 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1743 {
1744 void *cp;
1745 void *delta;
1746 void *deflated;
1747 void *data;
1748 unsigned long orig_size;
1749 unsigned long delta_size;
1750 unsigned long deflate_size;
1751 unsigned long data_size;
1752
1753 /* We could do deflated delta, or we could do just deflated two,
1754 * whichever is smaller.
1755 */
1756 delta = NULL;
1757 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1758 if (one->size && two->size) {
1759 delta = diff_delta(one->ptr, one->size,
1760 two->ptr, two->size,
1761 &delta_size, deflate_size);
1762 if (delta) {
1763 void *to_free = delta;
1764 orig_size = delta_size;
1765 delta = deflate_it(delta, delta_size, &delta_size);
1766 free(to_free);
1767 }
1768 }
1769
1770 if (delta && delta_size < deflate_size) {
1771 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1772 free(deflated);
1773 data = delta;
1774 data_size = delta_size;
1775 }
1776 else {
1777 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1778 free(delta);
1779 data = deflated;
1780 data_size = deflate_size;
1781 }
1782
1783 /* emit data encoded in base85 */
1784 cp = data;
1785 while (data_size) {
1786 int bytes = (52 < data_size) ? 52 : data_size;
1787 char line[70];
1788 data_size -= bytes;
1789 if (bytes <= 26)
1790 line[0] = bytes + 'A' - 1;
1791 else
1792 line[0] = bytes - 26 + 'a' - 1;
1793 encode_85(line + 1, cp, bytes);
1794 cp = (char *) cp + bytes;
1795 fprintf(file, "%s", prefix);
1796 fputs(line, file);
1797 fputc('\n', file);
1798 }
1799 fprintf(file, "%s\n", prefix);
1800 free(data);
1801 }
1802
1803 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1804 {
1805 fprintf(file, "%sGIT binary patch\n", prefix);
1806 emit_binary_diff_body(file, one, two, prefix);
1807 emit_binary_diff_body(file, two, one, prefix);
1808 }
1809
1810 static void diff_filespec_load_driver(struct diff_filespec *one)
1811 {
1812 /* Use already-loaded driver */
1813 if (one->driver)
1814 return;
1815
1816 if (S_ISREG(one->mode))
1817 one->driver = userdiff_find_by_path(one->path);
1818
1819 /* Fallback to default settings */
1820 if (!one->driver)
1821 one->driver = userdiff_find_by_name("default");
1822 }
1823
1824 int diff_filespec_is_binary(struct diff_filespec *one)
1825 {
1826 if (one->is_binary == -1) {
1827 diff_filespec_load_driver(one);
1828 if (one->driver->binary != -1)
1829 one->is_binary = one->driver->binary;
1830 else {
1831 if (!one->data && DIFF_FILE_VALID(one))
1832 diff_populate_filespec(one, 0);
1833 if (one->data)
1834 one->is_binary = buffer_is_binary(one->data,
1835 one->size);
1836 if (one->is_binary == -1)
1837 one->is_binary = 0;
1838 }
1839 }
1840 return one->is_binary;
1841 }
1842
1843 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1844 {
1845 diff_filespec_load_driver(one);
1846 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1847 }
1848
1849 static const char *userdiff_word_regex(struct diff_filespec *one)
1850 {
1851 diff_filespec_load_driver(one);
1852 return one->driver->word_regex;
1853 }
1854
1855 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1856 {
1857 if (!options->a_prefix)
1858 options->a_prefix = a;
1859 if (!options->b_prefix)
1860 options->b_prefix = b;
1861 }
1862
1863 struct userdiff_driver *get_textconv(struct diff_filespec *one)
1864 {
1865 if (!DIFF_FILE_VALID(one))
1866 return NULL;
1867
1868 diff_filespec_load_driver(one);
1869 if (!one->driver->textconv)
1870 return NULL;
1871
1872 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1873 struct notes_cache *c = xmalloc(sizeof(*c));
1874 struct strbuf name = STRBUF_INIT;
1875
1876 strbuf_addf(&name, "textconv/%s", one->driver->name);
1877 notes_cache_init(c, name.buf, one->driver->textconv);
1878 one->driver->textconv_cache = c;
1879 }
1880
1881 return one->driver;
1882 }
1883
1884 static void builtin_diff(const char *name_a,
1885 const char *name_b,
1886 struct diff_filespec *one,
1887 struct diff_filespec *two,
1888 const char *xfrm_msg,
1889 int must_show_header,
1890 struct diff_options *o,
1891 int complete_rewrite)
1892 {
1893 mmfile_t mf1, mf2;
1894 const char *lbl[2];
1895 char *a_one, *b_two;
1896 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1897 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1898 const char *a_prefix, *b_prefix;
1899 struct userdiff_driver *textconv_one = NULL;
1900 struct userdiff_driver *textconv_two = NULL;
1901 struct strbuf header = STRBUF_INIT;
1902 struct strbuf *msgbuf;
1903 char *line_prefix = "";
1904
1905 if (o->output_prefix) {
1906 msgbuf = o->output_prefix(o, o->output_prefix_data);
1907 line_prefix = msgbuf->buf;
1908 }
1909
1910 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1911 (!one->mode || S_ISGITLINK(one->mode)) &&
1912 (!two->mode || S_ISGITLINK(two->mode))) {
1913 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1914 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1915 show_submodule_summary(o->file, one ? one->path : two->path,
1916 one->sha1, two->sha1, two->dirty_submodule,
1917 del, add, reset);
1918 return;
1919 }
1920
1921 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1922 textconv_one = get_textconv(one);
1923 textconv_two = get_textconv(two);
1924 }
1925
1926 diff_set_mnemonic_prefix(o, "a/", "b/");
1927 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1928 a_prefix = o->b_prefix;
1929 b_prefix = o->a_prefix;
1930 } else {
1931 a_prefix = o->a_prefix;
1932 b_prefix = o->b_prefix;
1933 }
1934
1935 /* Never use a non-valid filename anywhere if at all possible */
1936 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1937 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1938
1939 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1940 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1941 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1942 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1943 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
1944 if (lbl[0][0] == '/') {
1945 /* /dev/null */
1946 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
1947 if (xfrm_msg)
1948 strbuf_addstr(&header, xfrm_msg);
1949 must_show_header = 1;
1950 }
1951 else if (lbl[1][0] == '/') {
1952 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
1953 if (xfrm_msg)
1954 strbuf_addstr(&header, xfrm_msg);
1955 must_show_header = 1;
1956 }
1957 else {
1958 if (one->mode != two->mode) {
1959 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
1960 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
1961 must_show_header = 1;
1962 }
1963 if (xfrm_msg)
1964 strbuf_addstr(&header, xfrm_msg);
1965
1966 /*
1967 * we do not run diff between different kind
1968 * of objects.
1969 */
1970 if ((one->mode ^ two->mode) & S_IFMT)
1971 goto free_ab_and_return;
1972 if (complete_rewrite &&
1973 (textconv_one || !diff_filespec_is_binary(one)) &&
1974 (textconv_two || !diff_filespec_is_binary(two))) {
1975 fprintf(o->file, "%s", header.buf);
1976 strbuf_reset(&header);
1977 emit_rewrite_diff(name_a, name_b, one, two,
1978 textconv_one, textconv_two, o);
1979 o->found_changes = 1;
1980 goto free_ab_and_return;
1981 }
1982 }
1983
1984 if (!DIFF_OPT_TST(o, TEXT) &&
1985 ( (!textconv_one && diff_filespec_is_binary(one)) ||
1986 (!textconv_two && diff_filespec_is_binary(two)) )) {
1987 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1988 die("unable to read files to diff");
1989 /* Quite common confusing case */
1990 if (mf1.size == mf2.size &&
1991 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1992 if (must_show_header)
1993 fprintf(o->file, "%s", header.buf);
1994 goto free_ab_and_return;
1995 }
1996 fprintf(o->file, "%s", header.buf);
1997 strbuf_reset(&header);
1998 if (DIFF_OPT_TST(o, BINARY))
1999 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2000 else
2001 fprintf(o->file, "%sBinary files %s and %s differ\n",
2002 line_prefix, lbl[0], lbl[1]);
2003 o->found_changes = 1;
2004 }
2005 else {
2006 /* Crazy xdl interfaces.. */
2007 const char *diffopts = getenv("GIT_DIFF_OPTS");
2008 xpparam_t xpp;
2009 xdemitconf_t xecfg;
2010 struct emit_callback ecbdata;
2011 const struct userdiff_funcname *pe;
2012
2013 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
2014 fprintf(o->file, "%s", header.buf);
2015 strbuf_reset(&header);
2016 }
2017
2018 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2019 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2020
2021 pe = diff_funcname_pattern(one);
2022 if (!pe)
2023 pe = diff_funcname_pattern(two);
2024
2025 memset(&xpp, 0, sizeof(xpp));
2026 memset(&xecfg, 0, sizeof(xecfg));
2027 memset(&ecbdata, 0, sizeof(ecbdata));
2028 ecbdata.label_path = lbl;
2029 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
2030 ecbdata.found_changesp = &o->found_changes;
2031 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2032 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2033 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2034 ecbdata.opt = o;
2035 ecbdata.header = header.len ? &header : NULL;
2036 xpp.flags = o->xdl_opts;
2037 xecfg.ctxlen = o->context;
2038 xecfg.interhunkctxlen = o->interhunkcontext;
2039 xecfg.flags = XDL_EMIT_FUNCNAMES;
2040 if (pe)
2041 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2042 if (!diffopts)
2043 ;
2044 else if (!prefixcmp(diffopts, "--unified="))
2045 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2046 else if (!prefixcmp(diffopts, "-u"))
2047 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2048 if (o->word_diff) {
2049 int i;
2050
2051 ecbdata.diff_words =
2052 xcalloc(1, sizeof(struct diff_words_data));
2053 ecbdata.diff_words->type = o->word_diff;
2054 ecbdata.diff_words->opt = o;
2055 if (!o->word_regex)
2056 o->word_regex = userdiff_word_regex(one);
2057 if (!o->word_regex)
2058 o->word_regex = userdiff_word_regex(two);
2059 if (!o->word_regex)
2060 o->word_regex = diff_word_regex_cfg;
2061 if (o->word_regex) {
2062 ecbdata.diff_words->word_regex = (regex_t *)
2063 xmalloc(sizeof(regex_t));
2064 if (regcomp(ecbdata.diff_words->word_regex,
2065 o->word_regex,
2066 REG_EXTENDED | REG_NEWLINE))
2067 die ("Invalid regular expression: %s",
2068 o->word_regex);
2069 }
2070 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2071 if (o->word_diff == diff_words_styles[i].type) {
2072 ecbdata.diff_words->style =
2073 &diff_words_styles[i];
2074 break;
2075 }
2076 }
2077 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2078 struct diff_words_style *st = ecbdata.diff_words->style;
2079 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2080 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2081 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2082 }
2083 }
2084 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2085 &xpp, &xecfg);
2086 if (o->word_diff)
2087 free_diff_words_data(&ecbdata);
2088 if (textconv_one)
2089 free(mf1.ptr);
2090 if (textconv_two)
2091 free(mf2.ptr);
2092 xdiff_clear_find_func(&xecfg);
2093 }
2094
2095 free_ab_and_return:
2096 strbuf_release(&header);
2097 diff_free_filespec_data(one);
2098 diff_free_filespec_data(two);
2099 free(a_one);
2100 free(b_two);
2101 return;
2102 }
2103
2104 static void builtin_diffstat(const char *name_a, const char *name_b,
2105 struct diff_filespec *one,
2106 struct diff_filespec *two,
2107 struct diffstat_t *diffstat,
2108 struct diff_options *o,
2109 int complete_rewrite)
2110 {
2111 mmfile_t mf1, mf2;
2112 struct diffstat_file *data;
2113
2114 data = diffstat_add(diffstat, name_a, name_b);
2115
2116 if (!one || !two) {
2117 data->is_unmerged = 1;
2118 return;
2119 }
2120
2121 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2122 data->is_binary = 1;
2123 data->added = diff_filespec_size(two);
2124 data->deleted = diff_filespec_size(one);
2125 }
2126
2127 else if (complete_rewrite) {
2128 diff_populate_filespec(one, 0);
2129 diff_populate_filespec(two, 0);
2130 data->deleted = count_lines(one->data, one->size);
2131 data->added = count_lines(two->data, two->size);
2132 }
2133
2134 else {
2135 /* Crazy xdl interfaces.. */
2136 xpparam_t xpp;
2137 xdemitconf_t xecfg;
2138
2139 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2140 die("unable to read files to diff");
2141
2142 memset(&xpp, 0, sizeof(xpp));
2143 memset(&xecfg, 0, sizeof(xecfg));
2144 xpp.flags = o->xdl_opts;
2145 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2146 &xpp, &xecfg);
2147 }
2148
2149 diff_free_filespec_data(one);
2150 diff_free_filespec_data(two);
2151 }
2152
2153 static void builtin_checkdiff(const char *name_a, const char *name_b,
2154 const char *attr_path,
2155 struct diff_filespec *one,
2156 struct diff_filespec *two,
2157 struct diff_options *o)
2158 {
2159 mmfile_t mf1, mf2;
2160 struct checkdiff_t data;
2161
2162 if (!two)
2163 return;
2164
2165 memset(&data, 0, sizeof(data));
2166 data.filename = name_b ? name_b : name_a;
2167 data.lineno = 0;
2168 data.o = o;
2169 data.ws_rule = whitespace_rule(attr_path);
2170 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2171
2172 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2173 die("unable to read files to diff");
2174
2175 /*
2176 * All the other codepaths check both sides, but not checking
2177 * the "old" side here is deliberate. We are checking the newly
2178 * introduced changes, and as long as the "new" side is text, we
2179 * can and should check what it introduces.
2180 */
2181 if (diff_filespec_is_binary(two))
2182 goto free_and_return;
2183 else {
2184 /* Crazy xdl interfaces.. */
2185 xpparam_t xpp;
2186 xdemitconf_t xecfg;
2187
2188 memset(&xpp, 0, sizeof(xpp));
2189 memset(&xecfg, 0, sizeof(xecfg));
2190 xecfg.ctxlen = 1; /* at least one context line */
2191 xpp.flags = 0;
2192 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2193 &xpp, &xecfg);
2194
2195 if (data.ws_rule & WS_BLANK_AT_EOF) {
2196 struct emit_callback ecbdata;
2197 int blank_at_eof;
2198
2199 ecbdata.ws_rule = data.ws_rule;
2200 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2201 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2202
2203 if (blank_at_eof) {
2204 static char *err;
2205 if (!err)
2206 err = whitespace_error_string(WS_BLANK_AT_EOF);
2207 fprintf(o->file, "%s:%d: %s.\n",
2208 data.filename, blank_at_eof, err);
2209 data.status = 1; /* report errors */
2210 }
2211 }
2212 }
2213 free_and_return:
2214 diff_free_filespec_data(one);
2215 diff_free_filespec_data(two);
2216 if (data.status)
2217 DIFF_OPT_SET(o, CHECK_FAILED);
2218 }
2219
2220 struct diff_filespec *alloc_filespec(const char *path)
2221 {
2222 int namelen = strlen(path);
2223 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2224
2225 memset(spec, 0, sizeof(*spec));
2226 spec->path = (char *)(spec + 1);
2227 memcpy(spec->path, path, namelen+1);
2228 spec->count = 1;
2229 spec->is_binary = -1;
2230 return spec;
2231 }
2232
2233 void free_filespec(struct diff_filespec *spec)
2234 {
2235 if (!--spec->count) {
2236 diff_free_filespec_data(spec);
2237 free(spec);
2238 }
2239 }
2240
2241 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2242 unsigned short mode)
2243 {
2244 if (mode) {
2245 spec->mode = canon_mode(mode);
2246 hashcpy(spec->sha1, sha1);
2247 spec->sha1_valid = !is_null_sha1(sha1);
2248 }
2249 }
2250
2251 /*
2252 * Given a name and sha1 pair, if the index tells us the file in
2253 * the work tree has that object contents, return true, so that
2254 * prepare_temp_file() does not have to inflate and extract.
2255 */
2256 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2257 {
2258 struct cache_entry *ce;
2259 struct stat st;
2260 int pos, len;
2261
2262 /*
2263 * We do not read the cache ourselves here, because the
2264 * benchmark with my previous version that always reads cache
2265 * shows that it makes things worse for diff-tree comparing
2266 * two linux-2.6 kernel trees in an already checked out work
2267 * tree. This is because most diff-tree comparisons deal with
2268 * only a small number of files, while reading the cache is
2269 * expensive for a large project, and its cost outweighs the
2270 * savings we get by not inflating the object to a temporary
2271 * file. Practically, this code only helps when we are used
2272 * by diff-cache --cached, which does read the cache before
2273 * calling us.
2274 */
2275 if (!active_cache)
2276 return 0;
2277
2278 /* We want to avoid the working directory if our caller
2279 * doesn't need the data in a normal file, this system
2280 * is rather slow with its stat/open/mmap/close syscalls,
2281 * and the object is contained in a pack file. The pack
2282 * is probably already open and will be faster to obtain
2283 * the data through than the working directory. Loose
2284 * objects however would tend to be slower as they need
2285 * to be individually opened and inflated.
2286 */
2287 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2288 return 0;
2289
2290 len = strlen(name);
2291 pos = cache_name_pos(name, len);
2292 if (pos < 0)
2293 return 0;
2294 ce = active_cache[pos];
2295
2296 /*
2297 * This is not the sha1 we are looking for, or
2298 * unreusable because it is not a regular file.
2299 */
2300 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2301 return 0;
2302
2303 /*
2304 * If ce is marked as "assume unchanged", there is no
2305 * guarantee that work tree matches what we are looking for.
2306 */
2307 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2308 return 0;
2309
2310 /*
2311 * If ce matches the file in the work tree, we can reuse it.
2312 */
2313 if (ce_uptodate(ce) ||
2314 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2315 return 1;
2316
2317 return 0;
2318 }
2319
2320 static int populate_from_stdin(struct diff_filespec *s)
2321 {
2322 struct strbuf buf = STRBUF_INIT;
2323 size_t size = 0;
2324
2325 if (strbuf_read(&buf, 0, 0) < 0)
2326 return error("error while reading from stdin %s",
2327 strerror(errno));
2328
2329 s->should_munmap = 0;
2330 s->data = strbuf_detach(&buf, &size);
2331 s->size = size;
2332 s->should_free = 1;
2333 return 0;
2334 }
2335
2336 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2337 {
2338 int len;
2339 char *data = xmalloc(100), *dirty = "";
2340
2341 /* Are we looking at the work tree? */
2342 if (s->dirty_submodule)
2343 dirty = "-dirty";
2344
2345 len = snprintf(data, 100,
2346 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2347 s->data = data;
2348 s->size = len;
2349 s->should_free = 1;
2350 if (size_only) {
2351 s->data = NULL;
2352 free(data);
2353 }
2354 return 0;
2355 }
2356
2357 /*
2358 * While doing rename detection and pickaxe operation, we may need to
2359 * grab the data for the blob (or file) for our own in-core comparison.
2360 * diff_filespec has data and size fields for this purpose.
2361 */
2362 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2363 {
2364 int err = 0;
2365 if (!DIFF_FILE_VALID(s))
2366 die("internal error: asking to populate invalid file.");
2367 if (S_ISDIR(s->mode))
2368 return -1;
2369
2370 if (s->data)
2371 return 0;
2372
2373 if (size_only && 0 < s->size)
2374 return 0;
2375
2376 if (S_ISGITLINK(s->mode))
2377 return diff_populate_gitlink(s, size_only);
2378
2379 if (!s->sha1_valid ||
2380 reuse_worktree_file(s->path, s->sha1, 0)) {
2381 struct strbuf buf = STRBUF_INIT;
2382 struct stat st;
2383 int fd;
2384
2385 if (!strcmp(s->path, "-"))
2386 return populate_from_stdin(s);
2387
2388 if (lstat(s->path, &st) < 0) {
2389 if (errno == ENOENT) {
2390 err_empty:
2391 err = -1;
2392 empty:
2393 s->data = (char *)"";
2394 s->size = 0;
2395 return err;
2396 }
2397 }
2398 s->size = xsize_t(st.st_size);
2399 if (!s->size)
2400 goto empty;
2401 if (S_ISLNK(st.st_mode)) {
2402 struct strbuf sb = STRBUF_INIT;
2403
2404 if (strbuf_readlink(&sb, s->path, s->size))
2405 goto err_empty;
2406 s->size = sb.len;
2407 s->data = strbuf_detach(&sb, NULL);
2408 s->should_free = 1;
2409 return 0;
2410 }
2411 if (size_only)
2412 return 0;
2413 fd = open(s->path, O_RDONLY);
2414 if (fd < 0)
2415 goto err_empty;
2416 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2417 close(fd);
2418 s->should_munmap = 1;
2419
2420 /*
2421 * Convert from working tree format to canonical git format
2422 */
2423 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2424 size_t size = 0;
2425 munmap(s->data, s->size);
2426 s->should_munmap = 0;
2427 s->data = strbuf_detach(&buf, &size);
2428 s->size = size;
2429 s->should_free = 1;
2430 }
2431 }
2432 else {
2433 enum object_type type;
2434 if (size_only) {
2435 type = sha1_object_info(s->sha1, &s->size);
2436 if (type < 0)
2437 die("unable to read %s", sha1_to_hex(s->sha1));
2438 } else {
2439 s->data = read_sha1_file(s->sha1, &type, &s->size);
2440 if (!s->data)
2441 die("unable to read %s", sha1_to_hex(s->sha1));
2442 s->should_free = 1;
2443 }
2444 }
2445 return 0;
2446 }
2447
2448 void diff_free_filespec_blob(struct diff_filespec *s)
2449 {
2450 if (s->should_free)
2451 free(s->data);
2452 else if (s->should_munmap)
2453 munmap(s->data, s->size);
2454
2455 if (s->should_free || s->should_munmap) {
2456 s->should_free = s->should_munmap = 0;
2457 s->data = NULL;
2458 }
2459 }
2460
2461 void diff_free_filespec_data(struct diff_filespec *s)
2462 {
2463 diff_free_filespec_blob(s);
2464 free(s->cnt_data);
2465 s->cnt_data = NULL;
2466 }
2467
2468 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2469 void *blob,
2470 unsigned long size,
2471 const unsigned char *sha1,
2472 int mode)
2473 {
2474 int fd;
2475 struct strbuf buf = STRBUF_INIT;
2476 struct strbuf template = STRBUF_INIT;
2477 char *path_dup = xstrdup(path);
2478 const char *base = basename(path_dup);
2479
2480 /* Generate "XXXXXX_basename.ext" */
2481 strbuf_addstr(&template, "XXXXXX_");
2482 strbuf_addstr(&template, base);
2483
2484 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2485 strlen(base) + 1);
2486 if (fd < 0)
2487 die_errno("unable to create temp-file");
2488 if (convert_to_working_tree(path,
2489 (const char *)blob, (size_t)size, &buf)) {
2490 blob = buf.buf;
2491 size = buf.len;
2492 }
2493 if (write_in_full(fd, blob, size) != size)
2494 die_errno("unable to write temp-file");
2495 close(fd);
2496 temp->name = temp->tmp_path;
2497 strcpy(temp->hex, sha1_to_hex(sha1));
2498 temp->hex[40] = 0;
2499 sprintf(temp->mode, "%06o", mode);
2500 strbuf_release(&buf);
2501 strbuf_release(&template);
2502 free(path_dup);
2503 }
2504
2505 static struct diff_tempfile *prepare_temp_file(const char *name,
2506 struct diff_filespec *one)
2507 {
2508 struct diff_tempfile *temp = claim_diff_tempfile();
2509
2510 if (!DIFF_FILE_VALID(one)) {
2511 not_a_valid_file:
2512 /* A '-' entry produces this for file-2, and
2513 * a '+' entry produces this for file-1.
2514 */
2515 temp->name = "/dev/null";
2516 strcpy(temp->hex, ".");
2517 strcpy(temp->mode, ".");
2518 return temp;
2519 }
2520
2521 if (!remove_tempfile_installed) {
2522 atexit(remove_tempfile);
2523 sigchain_push_common(remove_tempfile_on_signal);
2524 remove_tempfile_installed = 1;
2525 }
2526
2527 if (!one->sha1_valid ||
2528 reuse_worktree_file(name, one->sha1, 1)) {
2529 struct stat st;
2530 if (lstat(name, &st) < 0) {
2531 if (errno == ENOENT)
2532 goto not_a_valid_file;
2533 die_errno("stat(%s)", name);
2534 }
2535 if (S_ISLNK(st.st_mode)) {
2536 struct strbuf sb = STRBUF_INIT;
2537 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2538 die_errno("readlink(%s)", name);
2539 prep_temp_blob(name, temp, sb.buf, sb.len,
2540 (one->sha1_valid ?
2541 one->sha1 : null_sha1),
2542 (one->sha1_valid ?
2543 one->mode : S_IFLNK));
2544 strbuf_release(&sb);
2545 }
2546 else {
2547 /* we can borrow from the file in the work tree */
2548 temp->name = name;
2549 if (!one->sha1_valid)
2550 strcpy(temp->hex, sha1_to_hex(null_sha1));
2551 else
2552 strcpy(temp->hex, sha1_to_hex(one->sha1));
2553 /* Even though we may sometimes borrow the
2554 * contents from the work tree, we always want
2555 * one->mode. mode is trustworthy even when
2556 * !(one->sha1_valid), as long as
2557 * DIFF_FILE_VALID(one).
2558 */
2559 sprintf(temp->mode, "%06o", one->mode);
2560 }
2561 return temp;
2562 }
2563 else {
2564 if (diff_populate_filespec(one, 0))
2565 die("cannot read data blob for %s", one->path);
2566 prep_temp_blob(name, temp, one->data, one->size,
2567 one->sha1, one->mode);
2568 }
2569 return temp;
2570 }
2571
2572 /* An external diff command takes:
2573 *
2574 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2575 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2576 *
2577 */
2578 static void run_external_diff(const char *pgm,
2579 const char *name,
2580 const char *other,
2581 struct diff_filespec *one,
2582 struct diff_filespec *two,
2583 const char *xfrm_msg,
2584 int complete_rewrite)
2585 {
2586 const char *spawn_arg[10];
2587 int retval;
2588 const char **arg = &spawn_arg[0];
2589
2590 if (one && two) {
2591 struct diff_tempfile *temp_one, *temp_two;
2592 const char *othername = (other ? other : name);
2593 temp_one = prepare_temp_file(name, one);
2594 temp_two = prepare_temp_file(othername, two);
2595 *arg++ = pgm;
2596 *arg++ = name;
2597 *arg++ = temp_one->name;
2598 *arg++ = temp_one->hex;
2599 *arg++ = temp_one->mode;
2600 *arg++ = temp_two->name;
2601 *arg++ = temp_two->hex;
2602 *arg++ = temp_two->mode;
2603 if (other) {
2604 *arg++ = other;
2605 *arg++ = xfrm_msg;
2606 }
2607 } else {
2608 *arg++ = pgm;
2609 *arg++ = name;
2610 }
2611 *arg = NULL;
2612 fflush(NULL);
2613 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2614 remove_tempfile();
2615 if (retval) {
2616 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2617 exit(1);
2618 }
2619 }
2620
2621 static int similarity_index(struct diff_filepair *p)
2622 {
2623 return p->score * 100 / MAX_SCORE;
2624 }
2625
2626 static void fill_metainfo(struct strbuf *msg,
2627 const char *name,
2628 const char *other,
2629 struct diff_filespec *one,
2630 struct diff_filespec *two,
2631 struct diff_options *o,
2632 struct diff_filepair *p,
2633 int *must_show_header,
2634 int use_color)
2635 {
2636 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2637 const char *reset = diff_get_color(use_color, DIFF_RESET);
2638 struct strbuf *msgbuf;
2639 char *line_prefix = "";
2640
2641 *must_show_header = 1;
2642 if (o->output_prefix) {
2643 msgbuf = o->output_prefix(o, o->output_prefix_data);
2644 line_prefix = msgbuf->buf;
2645 }
2646 strbuf_init(msg, PATH_MAX * 2 + 300);
2647 switch (p->status) {
2648 case DIFF_STATUS_COPIED:
2649 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2650 line_prefix, set, similarity_index(p));
2651 strbuf_addf(msg, "%s\n%s%scopy from ",
2652 reset, line_prefix, set);
2653 quote_c_style(name, msg, NULL, 0);
2654 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2655 quote_c_style(other, msg, NULL, 0);
2656 strbuf_addf(msg, "%s\n", reset);
2657 break;
2658 case DIFF_STATUS_RENAMED:
2659 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2660 line_prefix, set, similarity_index(p));
2661 strbuf_addf(msg, "%s\n%s%srename from ",
2662 reset, line_prefix, set);
2663 quote_c_style(name, msg, NULL, 0);
2664 strbuf_addf(msg, "%s\n%s%srename to ",
2665 reset, line_prefix, set);
2666 quote_c_style(other, msg, NULL, 0);
2667 strbuf_addf(msg, "%s\n", reset);
2668 break;
2669 case DIFF_STATUS_MODIFIED:
2670 if (p->score) {
2671 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2672 line_prefix,
2673 set, similarity_index(p), reset);
2674 break;
2675 }
2676 /* fallthru */
2677 default:
2678 *must_show_header = 0;
2679 }
2680 if (one && two && hashcmp(one->sha1, two->sha1)) {
2681 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2682
2683 if (DIFF_OPT_TST(o, BINARY)) {
2684 mmfile_t mf;
2685 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2686 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2687 abbrev = 40;
2688 }
2689 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2690 find_unique_abbrev(one->sha1, abbrev));
2691 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2692 if (one->mode == two->mode)
2693 strbuf_addf(msg, " %06o", one->mode);
2694 strbuf_addf(msg, "%s\n", reset);
2695 }
2696 }
2697
2698 static void run_diff_cmd(const char *pgm,
2699 const char *name,
2700 const char *other,
2701 const char *attr_path,
2702 struct diff_filespec *one,
2703 struct diff_filespec *two,
2704 struct strbuf *msg,
2705 struct diff_options *o,
2706 struct diff_filepair *p)
2707 {
2708 const char *xfrm_msg = NULL;
2709 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2710 int must_show_header = 0;
2711
2712 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2713 pgm = NULL;
2714 else {
2715 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2716 if (drv && drv->external)
2717 pgm = drv->external;
2718 }
2719
2720 if (msg) {
2721 /*
2722 * don't use colors when the header is intended for an
2723 * external diff driver
2724 */
2725 fill_metainfo(msg, name, other, one, two, o, p,
2726 &must_show_header,
2727 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2728 xfrm_msg = msg->len ? msg->buf : NULL;
2729 }
2730
2731 if (pgm) {
2732 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2733 complete_rewrite);
2734 return;
2735 }
2736 if (one && two)
2737 builtin_diff(name, other ? other : name,
2738 one, two, xfrm_msg, must_show_header,
2739 o, complete_rewrite);
2740 else
2741 fprintf(o->file, "* Unmerged path %s\n", name);
2742 }
2743
2744 static void diff_fill_sha1_info(struct diff_filespec *one)
2745 {
2746 if (DIFF_FILE_VALID(one)) {
2747 if (!one->sha1_valid) {
2748 struct stat st;
2749 if (!strcmp(one->path, "-")) {
2750 hashcpy(one->sha1, null_sha1);
2751 return;
2752 }
2753 if (lstat(one->path, &st) < 0)
2754 die_errno("stat '%s'", one->path);
2755 if (index_path(one->sha1, one->path, &st, 0))
2756 die("cannot hash %s", one->path);
2757 }
2758 }
2759 else
2760 hashclr(one->sha1);
2761 }
2762
2763 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2764 {
2765 /* Strip the prefix but do not molest /dev/null and absolute paths */
2766 if (*namep && **namep != '/') {
2767 *namep += prefix_length;
2768 if (**namep == '/')
2769 ++*namep;
2770 }
2771 if (*otherp && **otherp != '/') {
2772 *otherp += prefix_length;
2773 if (**otherp == '/')
2774 ++*otherp;
2775 }
2776 }
2777
2778 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2779 {
2780 const char *pgm = external_diff();
2781 struct strbuf msg;
2782 struct diff_filespec *one = p->one;
2783 struct diff_filespec *two = p->two;
2784 const char *name;
2785 const char *other;
2786 const char *attr_path;
2787
2788 name = p->one->path;
2789 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2790 attr_path = name;
2791 if (o->prefix_length)
2792 strip_prefix(o->prefix_length, &name, &other);
2793
2794 if (DIFF_PAIR_UNMERGED(p)) {
2795 run_diff_cmd(pgm, name, NULL, attr_path,
2796 NULL, NULL, NULL, o, p);
2797 return;
2798 }
2799
2800 diff_fill_sha1_info(one);
2801 diff_fill_sha1_info(two);
2802
2803 if (!pgm &&
2804 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2805 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2806 /*
2807 * a filepair that changes between file and symlink
2808 * needs to be split into deletion and creation.
2809 */
2810 struct diff_filespec *null = alloc_filespec(two->path);
2811 run_diff_cmd(NULL, name, other, attr_path,
2812 one, null, &msg, o, p);
2813 free(null);
2814 strbuf_release(&msg);
2815
2816 null = alloc_filespec(one->path);
2817 run_diff_cmd(NULL, name, other, attr_path,
2818 null, two, &msg, o, p);
2819 free(null);
2820 }
2821 else
2822 run_diff_cmd(pgm, name, other, attr_path,
2823 one, two, &msg, o, p);
2824
2825 strbuf_release(&msg);
2826 }
2827
2828 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2829 struct diffstat_t *diffstat)
2830 {
2831 const char *name;
2832 const char *other;
2833 int complete_rewrite = 0;
2834
2835 if (DIFF_PAIR_UNMERGED(p)) {
2836 /* unmerged */
2837 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2838 return;
2839 }
2840
2841 name = p->one->path;
2842 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2843
2844 if (o->prefix_length)
2845 strip_prefix(o->prefix_length, &name, &other);
2846
2847 diff_fill_sha1_info(p->one);
2848 diff_fill_sha1_info(p->two);
2849
2850 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2851 complete_rewrite = 1;
2852 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2853 }
2854
2855 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2856 {
2857 const char *name;
2858 const char *other;
2859 const char *attr_path;
2860
2861 if (DIFF_PAIR_UNMERGED(p)) {
2862 /* unmerged */
2863 return;
2864 }
2865
2866 name = p->one->path;
2867 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2868 attr_path = other ? other : name;
2869
2870 if (o->prefix_length)
2871 strip_prefix(o->prefix_length, &name, &other);
2872
2873 diff_fill_sha1_info(p->one);
2874 diff_fill_sha1_info(p->two);
2875
2876 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2877 }
2878
2879 void diff_setup(struct diff_options *options)
2880 {
2881 memcpy(options, &default_diff_options, sizeof(*options));
2882
2883 options->file = stdout;
2884
2885 options->line_termination = '\n';
2886 options->break_opt = -1;
2887 options->rename_limit = -1;
2888 options->dirstat_percent = 3;
2889 options->context = 3;
2890
2891 options->change = diff_change;
2892 options->add_remove = diff_addremove;
2893 if (diff_use_color_default > 0)
2894 DIFF_OPT_SET(options, COLOR_DIFF);
2895 options->detect_rename = diff_detect_rename_default;
2896
2897 if (diff_no_prefix) {
2898 options->a_prefix = options->b_prefix = "";
2899 } else if (!diff_mnemonic_prefix) {
2900 options->a_prefix = "a/";
2901 options->b_prefix = "b/";
2902 }
2903 }
2904
2905 int diff_setup_done(struct diff_options *options)
2906 {
2907 int count = 0;
2908
2909 if (options->output_format & DIFF_FORMAT_NAME)
2910 count++;
2911 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2912 count++;
2913 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2914 count++;
2915 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2916 count++;
2917 if (count > 1)
2918 die("--name-only, --name-status, --check and -s are mutually exclusive");
2919
2920 /*
2921 * Most of the time we can say "there are changes"
2922 * only by checking if there are changed paths, but
2923 * --ignore-whitespace* options force us to look
2924 * inside contents.
2925 */
2926
2927 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2928 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2929 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2930 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2931 else
2932 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2933
2934 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2935 options->detect_rename = DIFF_DETECT_COPY;
2936
2937 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2938 options->prefix = NULL;
2939 if (options->prefix)
2940 options->prefix_length = strlen(options->prefix);
2941 else
2942 options->prefix_length = 0;
2943
2944 if (options->output_format & (DIFF_FORMAT_NAME |
2945 DIFF_FORMAT_NAME_STATUS |
2946 DIFF_FORMAT_CHECKDIFF |
2947 DIFF_FORMAT_NO_OUTPUT))
2948 options->output_format &= ~(DIFF_FORMAT_RAW |
2949 DIFF_FORMAT_NUMSTAT |
2950 DIFF_FORMAT_DIFFSTAT |
2951 DIFF_FORMAT_SHORTSTAT |
2952 DIFF_FORMAT_DIRSTAT |
2953 DIFF_FORMAT_SUMMARY |
2954 DIFF_FORMAT_PATCH);
2955
2956 /*
2957 * These cases always need recursive; we do not drop caller-supplied
2958 * recursive bits for other formats here.
2959 */
2960 if (options->output_format & (DIFF_FORMAT_PATCH |
2961 DIFF_FORMAT_NUMSTAT |
2962 DIFF_FORMAT_DIFFSTAT |
2963 DIFF_FORMAT_SHORTSTAT |
2964 DIFF_FORMAT_DIRSTAT |
2965 DIFF_FORMAT_SUMMARY |
2966 DIFF_FORMAT_CHECKDIFF))
2967 DIFF_OPT_SET(options, RECURSIVE);
2968 /*
2969 * Also pickaxe would not work very well if you do not say recursive
2970 */
2971 if (options->pickaxe)
2972 DIFF_OPT_SET(options, RECURSIVE);
2973 /*
2974 * When patches are generated, submodules diffed against the work tree
2975 * must be checked for dirtiness too so it can be shown in the output
2976 */
2977 if (options->output_format & DIFF_FORMAT_PATCH)
2978 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2979
2980 if (options->detect_rename && options->rename_limit < 0)
2981 options->rename_limit = diff_rename_limit_default;
2982 if (options->setup & DIFF_SETUP_USE_CACHE) {
2983 if (!active_cache)
2984 /* read-cache does not die even when it fails
2985 * so it is safe for us to do this here. Also
2986 * it does not smudge active_cache or active_nr
2987 * when it fails, so we do not have to worry about
2988 * cleaning it up ourselves either.
2989 */
2990 read_cache();
2991 }
2992 if (options->abbrev <= 0 || 40 < options->abbrev)
2993 options->abbrev = 40; /* full */
2994
2995 /*
2996 * It does not make sense to show the first hit we happened
2997 * to have found. It does not make sense not to return with
2998 * exit code in such a case either.
2999 */
3000 if (DIFF_OPT_TST(options, QUICK)) {
3001 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3002 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3003 }
3004
3005 return 0;
3006 }
3007
3008 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3009 {
3010 char c, *eq;
3011 int len;
3012
3013 if (*arg != '-')
3014 return 0;
3015 c = *++arg;
3016 if (!c)
3017 return 0;
3018 if (c == arg_short) {
3019 c = *++arg;
3020 if (!c)
3021 return 1;
3022 if (val && isdigit(c)) {
3023 char *end;
3024 int n = strtoul(arg, &end, 10);
3025 if (*end)
3026 return 0;
3027 *val = n;
3028 return 1;
3029 }
3030 return 0;
3031 }
3032 if (c != '-')
3033 return 0;
3034 arg++;
3035 eq = strchr(arg, '=');
3036 if (eq)
3037 len = eq - arg;
3038 else
3039 len = strlen(arg);
3040 if (!len || strncmp(arg, arg_long, len))
3041 return 0;
3042 if (eq) {
3043 int n;
3044 char *end;
3045 if (!isdigit(*++eq))
3046 return 0;
3047 n = strtoul(eq, &end, 10);
3048 if (*end)
3049 return 0;
3050 *val = n;
3051 }
3052 return 1;
3053 }
3054
3055 static int diff_scoreopt_parse(const char *opt);
3056
3057 static inline int short_opt(char opt, const char **argv,
3058 const char **optarg)
3059 {
3060 const char *arg = argv[0];
3061 if (arg[0] != '-' || arg[1] != opt)
3062 return 0;
3063 if (arg[2] != '\0') {
3064 *optarg = arg + 2;
3065 return 1;
3066 }
3067 if (!argv[1])
3068 die("Option '%c' requires a value", opt);
3069 *optarg = argv[1];
3070 return 2;
3071 }
3072
3073 int parse_long_opt(const char *opt, const char **argv,
3074 const char **optarg)
3075 {
3076 const char *arg = argv[0];
3077 if (arg[0] != '-' || arg[1] != '-')
3078 return 0;
3079 arg += strlen("--");
3080 if (prefixcmp(arg, opt))
3081 return 0;
3082 arg += strlen(opt);
3083 if (*arg == '=') { /* sticked form: --option=value */
3084 *optarg = arg + 1;
3085 return 1;
3086 }
3087 if (*arg != '\0')
3088 return 0;
3089 /* separate form: --option value */
3090 if (!argv[1])
3091 die("Option '--%s' requires a value", opt);
3092 *optarg = argv[1];
3093 return 2;
3094 }
3095
3096 static int stat_opt(struct diff_options *options, const char **av)
3097 {
3098 const char *arg = av[0];
3099 char *end;
3100 int width = options->stat_width;
3101 int name_width = options->stat_name_width;
3102 int argcount = 1;
3103
3104 arg += strlen("--stat");
3105 end = (char *)arg;
3106
3107 switch (*arg) {
3108 case '-':
3109 if (!prefixcmp(arg, "-width")) {
3110 arg += strlen("-width");
3111 if (*arg == '=')
3112 width = strtoul(arg + 1, &end, 10);
3113 else if (!*arg && !av[1])
3114 die("Option '--stat-width' requires a value");
3115 else if (!*arg) {
3116 width = strtoul(av[1], &end, 10);
3117 argcount = 2;
3118 }
3119 } else if (!prefixcmp(arg, "-name-width")) {
3120 arg += strlen("-name-width");
3121 if (*arg == '=')
3122 name_width = strtoul(arg + 1, &end, 10);
3123 else if (!*arg && !av[1])
3124 die("Option '--stat-name-width' requires a value");
3125 else if (!*arg) {
3126 name_width = strtoul(av[1], &end, 10);
3127 argcount = 2;
3128 }
3129 }
3130 break;
3131 case '=':
3132 width = strtoul(arg+1, &end, 10);
3133 if (*end == ',')
3134 name_width = strtoul(end+1, &end, 10);
3135 }
3136
3137 /* Important! This checks all the error cases! */
3138 if (*end)
3139 return 0;
3140 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3141 options->stat_name_width = name_width;
3142 options->stat_width = width;
3143 return argcount;
3144 }
3145
3146 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3147 {
3148 const char *arg = av[0];
3149 const char *optarg;
3150 int argcount;
3151
3152 /* Output format options */
3153 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3154 options->output_format |= DIFF_FORMAT_PATCH;
3155 else if (opt_arg(arg, 'U', "unified", &options->context))
3156 options->output_format |= DIFF_FORMAT_PATCH;
3157 else if (!strcmp(arg, "--raw"))
3158 options->output_format |= DIFF_FORMAT_RAW;
3159 else if (!strcmp(arg, "--patch-with-raw"))
3160 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3161 else if (!strcmp(arg, "--numstat"))
3162 options->output_format |= DIFF_FORMAT_NUMSTAT;
3163 else if (!strcmp(arg, "--shortstat"))
3164 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3165 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
3166 options->output_format |= DIFF_FORMAT_DIRSTAT;
3167 else if (!strcmp(arg, "--cumulative")) {
3168 options->output_format |= DIFF_FORMAT_DIRSTAT;
3169 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
3170 } else if (opt_arg(arg, 0, "dirstat-by-file",
3171 &options->dirstat_percent)) {
3172 options->output_format |= DIFF_FORMAT_DIRSTAT;
3173 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
3174 }
3175 else if (!strcmp(arg, "--check"))
3176 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3177 else if (!strcmp(arg, "--summary"))
3178 options->output_format |= DIFF_FORMAT_SUMMARY;
3179 else if (!strcmp(arg, "--patch-with-stat"))
3180 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3181 else if (!strcmp(arg, "--name-only"))
3182 options->output_format |= DIFF_FORMAT_NAME;
3183 else if (!strcmp(arg, "--name-status"))
3184 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3185 else if (!strcmp(arg, "-s"))
3186 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3187 else if (!prefixcmp(arg, "--stat"))
3188 /* --stat, --stat-width, or --stat-name-width */
3189 return stat_opt(options, av);
3190
3191 /* renames options */
3192 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3193 !strcmp(arg, "--break-rewrites")) {
3194 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3195 return error("invalid argument to -B: %s", arg+2);
3196 }
3197 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3198 !strcmp(arg, "--find-renames")) {
3199 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3200 return error("invalid argument to -M: %s", arg+2);
3201 options->detect_rename = DIFF_DETECT_RENAME;
3202 }
3203 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3204 !strcmp(arg, "--find-copies")) {
3205 if (options->detect_rename == DIFF_DETECT_COPY)
3206 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3207 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3208 return error("invalid argument to -C: %s", arg+2);
3209 options->detect_rename = DIFF_DETECT_COPY;
3210 }
3211 else if (!strcmp(arg, "--no-renames"))
3212 options->detect_rename = 0;
3213 else if (!strcmp(arg, "--relative"))
3214 DIFF_OPT_SET(options, RELATIVE_NAME);
3215 else if (!prefixcmp(arg, "--relative=")) {
3216 DIFF_OPT_SET(options, RELATIVE_NAME);
3217 options->prefix = arg + 11;
3218 }
3219
3220 /* xdiff options */
3221 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3222 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3223 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3224 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3225 else if (!strcmp(arg, "--ignore-space-at-eol"))
3226 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3227 else if (!strcmp(arg, "--patience"))
3228 DIFF_XDL_SET(options, PATIENCE_DIFF);
3229
3230 /* flags options */
3231 else if (!strcmp(arg, "--binary")) {
3232 options->output_format |= DIFF_FORMAT_PATCH;
3233 DIFF_OPT_SET(options, BINARY);
3234 }
3235 else if (!strcmp(arg, "--full-index"))
3236 DIFF_OPT_SET(options, FULL_INDEX);
3237 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3238 DIFF_OPT_SET(options, TEXT);
3239 else if (!strcmp(arg, "-R"))
3240 DIFF_OPT_SET(options, REVERSE_DIFF);
3241 else if (!strcmp(arg, "--find-copies-harder"))
3242 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3243 else if (!strcmp(arg, "--follow"))
3244 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3245 else if (!strcmp(arg, "--color"))
3246 DIFF_OPT_SET(options, COLOR_DIFF);
3247 else if (!prefixcmp(arg, "--color=")) {
3248 int value = git_config_colorbool(NULL, arg+8, -1);
3249 if (value == 0)
3250 DIFF_OPT_CLR(options, COLOR_DIFF);
3251 else if (value > 0)
3252 DIFF_OPT_SET(options, COLOR_DIFF);
3253 else
3254 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3255 }
3256 else if (!strcmp(arg, "--no-color"))
3257 DIFF_OPT_CLR(options, COLOR_DIFF);
3258 else if (!strcmp(arg, "--color-words")) {
3259 DIFF_OPT_SET(options, COLOR_DIFF);
3260 options->word_diff = DIFF_WORDS_COLOR;
3261 }
3262 else if (!prefixcmp(arg, "--color-words=")) {
3263 DIFF_OPT_SET(options, COLOR_DIFF);
3264 options->word_diff = DIFF_WORDS_COLOR;
3265 options->word_regex = arg + 14;
3266 }
3267 else if (!strcmp(arg, "--word-diff")) {
3268 if (options->word_diff == DIFF_WORDS_NONE)
3269 options->word_diff = DIFF_WORDS_PLAIN;
3270 }
3271 else if (!prefixcmp(arg, "--word-diff=")) {
3272 const char *type = arg + 12;
3273 if (!strcmp(type, "plain"))
3274 options->word_diff = DIFF_WORDS_PLAIN;
3275 else if (!strcmp(type, "color")) {
3276 DIFF_OPT_SET(options, COLOR_DIFF);
3277 options->word_diff = DIFF_WORDS_COLOR;
3278 }
3279 else if (!strcmp(type, "porcelain"))
3280 options->word_diff = DIFF_WORDS_PORCELAIN;
3281 else if (!strcmp(type, "none"))
3282 options->word_diff = DIFF_WORDS_NONE;
3283 else
3284 die("bad --word-diff argument: %s", type);
3285 }
3286 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3287 if (options->word_diff == DIFF_WORDS_NONE)
3288 options->word_diff = DIFF_WORDS_PLAIN;
3289 options->word_regex = optarg;
3290 return argcount;
3291 }
3292 else if (!strcmp(arg, "--exit-code"))
3293 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3294 else if (!strcmp(arg, "--quiet"))
3295 DIFF_OPT_SET(options, QUICK);
3296 else if (!strcmp(arg, "--ext-diff"))
3297 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3298 else if (!strcmp(arg, "--no-ext-diff"))
3299 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3300 else if (!strcmp(arg, "--textconv"))
3301 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3302 else if (!strcmp(arg, "--no-textconv"))
3303 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3304 else if (!strcmp(arg, "--ignore-submodules")) {
3305 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3306 handle_ignore_submodules_arg(options, "all");
3307 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3308 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3309 handle_ignore_submodules_arg(options, arg + 20);
3310 } else if (!strcmp(arg, "--submodule"))
3311 DIFF_OPT_SET(options, SUBMODULE_LOG);
3312 else if (!prefixcmp(arg, "--submodule=")) {
3313 if (!strcmp(arg + 12, "log"))
3314 DIFF_OPT_SET(options, SUBMODULE_LOG);
3315 }
3316
3317 /* misc options */
3318 else if (!strcmp(arg, "-z"))
3319 options->line_termination = 0;
3320 else if ((argcount = short_opt('l', av, &optarg))) {
3321 options->rename_limit = strtoul(optarg, NULL, 10);
3322 return argcount;
3323 }
3324 else if ((argcount = short_opt('S', av, &optarg))) {
3325 options->pickaxe = optarg;
3326 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3327 return argcount;
3328 } else if ((argcount = short_opt('G', av, &optarg))) {
3329 options->pickaxe = optarg;
3330 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3331 return argcount;
3332 }
3333 else if (!strcmp(arg, "--pickaxe-all"))
3334 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3335 else if (!strcmp(arg, "--pickaxe-regex"))
3336 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3337 else if ((argcount = short_opt('O', av, &optarg))) {
3338 options->orderfile = optarg;
3339 return argcount;
3340 }
3341 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3342 options->filter = optarg;
3343 return argcount;
3344 }
3345 else if (!strcmp(arg, "--abbrev"))
3346 options->abbrev = DEFAULT_ABBREV;
3347 else if (!prefixcmp(arg, "--abbrev=")) {
3348 options->abbrev = strtoul(arg + 9, NULL, 10);
3349 if (options->abbrev < MINIMUM_ABBREV)
3350 options->abbrev = MINIMUM_ABBREV;
3351 else if (40 < options->abbrev)
3352 options->abbrev = 40;
3353 }
3354 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3355 options->a_prefix = optarg;
3356 return argcount;
3357 }
3358 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3359 options->b_prefix = optarg;
3360 return argcount;
3361 }
3362 else if (!strcmp(arg, "--no-prefix"))
3363 options->a_prefix = options->b_prefix = "";
3364 else if (opt_arg(arg, '\0', "inter-hunk-context",
3365 &options->interhunkcontext))
3366 ;
3367 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3368 options->file = fopen(optarg, "w");
3369 if (!options->file)
3370 die_errno("Could not open '%s'", optarg);
3371 options->close_file = 1;
3372 return argcount;
3373 } else
3374 return 0;
3375 return 1;
3376 }
3377
3378 int parse_rename_score(const char **cp_p)
3379 {
3380 unsigned long num, scale;
3381 int ch, dot;
3382 const char *cp = *cp_p;
3383
3384 num = 0;
3385 scale = 1;
3386 dot = 0;
3387 for (;;) {
3388 ch = *cp;
3389 if ( !dot && ch == '.' ) {
3390 scale = 1;
3391 dot = 1;
3392 } else if ( ch == '%' ) {
3393 scale = dot ? scale*100 : 100;
3394 cp++; /* % is always at the end */
3395 break;
3396 } else if ( ch >= '0' && ch <= '9' ) {
3397 if ( scale < 100000 ) {
3398 scale *= 10;
3399 num = (num*10) + (ch-'0');
3400 }
3401 } else {
3402 break;
3403 }
3404 cp++;
3405 }
3406 *cp_p = cp;
3407
3408 /* user says num divided by scale and we say internally that
3409 * is MAX_SCORE * num / scale.
3410 */
3411 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3412 }
3413
3414 static int diff_scoreopt_parse(const char *opt)
3415 {
3416 int opt1, opt2, cmd;
3417
3418 if (*opt++ != '-')
3419 return -1;
3420 cmd = *opt++;
3421 if (cmd == '-') {
3422 /* convert the long-form arguments into short-form versions */
3423 if (!prefixcmp(opt, "break-rewrites")) {
3424 opt += strlen("break-rewrites");
3425 if (*opt == 0 || *opt++ == '=')
3426 cmd = 'B';
3427 } else if (!prefixcmp(opt, "find-copies")) {
3428 opt += strlen("find-copies");
3429 if (*opt == 0 || *opt++ == '=')
3430 cmd = 'C';
3431 } else if (!prefixcmp(opt, "find-renames")) {
3432 opt += strlen("find-renames");
3433 if (*opt == 0 || *opt++ == '=')
3434 cmd = 'M';
3435 }
3436 }
3437 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3438 return -1; /* that is not a -M, -C nor -B option */
3439
3440 opt1 = parse_rename_score(&opt);
3441 if (cmd != 'B')
3442 opt2 = 0;
3443 else {
3444 if (*opt == 0)
3445 opt2 = 0;
3446 else if (*opt != '/')
3447 return -1; /* we expect -B80/99 or -B80 */
3448 else {
3449 opt++;
3450 opt2 = parse_rename_score(&opt);
3451 }
3452 }
3453 if (*opt != 0)
3454 return -1;
3455 return opt1 | (opt2 << 16);
3456 }
3457
3458 struct diff_queue_struct diff_queued_diff;
3459
3460 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3461 {
3462 if (queue->alloc <= queue->nr) {
3463 queue->alloc = alloc_nr(queue->alloc);
3464 queue->queue = xrealloc(queue->queue,
3465 sizeof(dp) * queue->alloc);
3466 }
3467 queue->queue[queue->nr++] = dp;
3468 }
3469
3470 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3471 struct diff_filespec *one,
3472 struct diff_filespec *two)
3473 {
3474 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3475 dp->one = one;
3476 dp->two = two;
3477 if (queue)
3478 diff_q(queue, dp);
3479 return dp;
3480 }
3481
3482 void diff_free_filepair(struct diff_filepair *p)
3483 {
3484 free_filespec(p->one);
3485 free_filespec(p->two);
3486 free(p);
3487 }
3488
3489 /* This is different from find_unique_abbrev() in that
3490 * it stuffs the result with dots for alignment.
3491 */
3492 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3493 {
3494 int abblen;
3495 const char *abbrev;
3496 if (len == 40)
3497 return sha1_to_hex(sha1);
3498
3499 abbrev = find_unique_abbrev(sha1, len);
3500 abblen = strlen(abbrev);
3501 if (abblen < 37) {
3502 static char hex[41];
3503 if (len < abblen && abblen <= len + 2)
3504 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3505 else
3506 sprintf(hex, "%s...", abbrev);
3507 return hex;
3508 }
3509 return sha1_to_hex(sha1);
3510 }
3511
3512 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3513 {
3514 int line_termination = opt->line_termination;
3515 int inter_name_termination = line_termination ? '\t' : '\0';
3516 if (opt->output_prefix) {
3517 struct strbuf *msg = NULL;
3518 msg = opt->output_prefix(opt, opt->output_prefix_data);
3519 fprintf(opt->file, "%s", msg->buf);
3520 }
3521
3522 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3523 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3524 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3525 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3526 }
3527 if (p->score) {
3528 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3529 inter_name_termination);
3530 } else {
3531 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3532 }
3533
3534 if (p->status == DIFF_STATUS_COPIED ||
3535 p->status == DIFF_STATUS_RENAMED) {
3536 const char *name_a, *name_b;
3537 name_a = p->one->path;
3538 name_b = p->two->path;
3539 strip_prefix(opt->prefix_length, &name_a, &name_b);
3540 write_name_quoted(name_a, opt->file, inter_name_termination);
3541 write_name_quoted(name_b, opt->file, line_termination);
3542 } else {
3543 const char *name_a, *name_b;
3544 name_a = p->one->mode ? p->one->path : p->two->path;
3545 name_b = NULL;
3546 strip_prefix(opt->prefix_length, &name_a, &name_b);
3547 write_name_quoted(name_a, opt->file, line_termination);
3548 }
3549 }
3550
3551 int diff_unmodified_pair(struct diff_filepair *p)
3552 {
3553 /* This function is written stricter than necessary to support
3554 * the currently implemented transformers, but the idea is to
3555 * let transformers to produce diff_filepairs any way they want,
3556 * and filter and clean them up here before producing the output.
3557 */
3558 struct diff_filespec *one = p->one, *two = p->two;
3559
3560 if (DIFF_PAIR_UNMERGED(p))
3561 return 0; /* unmerged is interesting */
3562
3563 /* deletion, addition, mode or type change
3564 * and rename are all interesting.
3565 */
3566 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3567 DIFF_PAIR_MODE_CHANGED(p) ||
3568 strcmp(one->path, two->path))
3569 return 0;
3570
3571 /* both are valid and point at the same path. that is, we are
3572 * dealing with a change.
3573 */
3574 if (one->sha1_valid && two->sha1_valid &&
3575 !hashcmp(one->sha1, two->sha1) &&
3576 !one->dirty_submodule && !two->dirty_submodule)
3577 return 1; /* no change */
3578 if (!one->sha1_valid && !two->sha1_valid)
3579 return 1; /* both look at the same file on the filesystem. */
3580 return 0;
3581 }
3582
3583 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3584 {
3585 if (diff_unmodified_pair(p))
3586 return;
3587
3588 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3589 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3590 return; /* no tree diffs in patch format */
3591
3592 run_diff(p, o);
3593 }
3594
3595 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3596 struct diffstat_t *diffstat)
3597 {
3598 if (diff_unmodified_pair(p))
3599 return;
3600
3601 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3602 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3603 return; /* no useful stat for tree diffs */
3604
3605 run_diffstat(p, o, diffstat);
3606 }
3607
3608 static void diff_flush_checkdiff(struct diff_filepair *p,
3609 struct diff_options *o)
3610 {
3611 if (diff_unmodified_pair(p))
3612 return;
3613
3614 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3615 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3616 return; /* nothing to check in tree diffs */
3617
3618 run_checkdiff(p, o);
3619 }
3620
3621 int diff_queue_is_empty(void)
3622 {
3623 struct diff_queue_struct *q = &diff_queued_diff;
3624 int i;
3625 for (i = 0; i < q->nr; i++)
3626 if (!diff_unmodified_pair(q->queue[i]))
3627 return 0;
3628 return 1;
3629 }
3630
3631 #if DIFF_DEBUG
3632 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3633 {
3634 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3635 x, one ? one : "",
3636 s->path,
3637 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3638 s->mode,
3639 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3640 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3641 x, one ? one : "",
3642 s->size, s->xfrm_flags);
3643 }
3644
3645 void diff_debug_filepair(const struct diff_filepair *p, int i)
3646 {
3647 diff_debug_filespec(p->one, i, "one");
3648 diff_debug_filespec(p->two, i, "two");
3649 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3650 p->score, p->status ? p->status : '?',
3651 p->one->rename_used, p->broken_pair);
3652 }
3653
3654 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3655 {
3656 int i;
3657 if (msg)
3658 fprintf(stderr, "%s\n", msg);
3659 fprintf(stderr, "q->nr = %d\n", q->nr);
3660 for (i = 0; i < q->nr; i++) {
3661 struct diff_filepair *p = q->queue[i];
3662 diff_debug_filepair(p, i);
3663 }
3664 }
3665 #endif
3666
3667 static void diff_resolve_rename_copy(void)
3668 {
3669 int i;
3670 struct diff_filepair *p;
3671 struct diff_queue_struct *q = &diff_queued_diff;
3672
3673 diff_debug_queue("resolve-rename-copy", q);
3674
3675 for (i = 0; i < q->nr; i++) {
3676 p = q->queue[i];
3677 p->status = 0; /* undecided */
3678 if (DIFF_PAIR_UNMERGED(p))
3679 p->status = DIFF_STATUS_UNMERGED;
3680 else if (!DIFF_FILE_VALID(p->one))
3681 p->status = DIFF_STATUS_ADDED;
3682 else if (!DIFF_FILE_VALID(p->two))
3683 p->status = DIFF_STATUS_DELETED;
3684 else if (DIFF_PAIR_TYPE_CHANGED(p))
3685 p->status = DIFF_STATUS_TYPE_CHANGED;
3686
3687 /* from this point on, we are dealing with a pair
3688 * whose both sides are valid and of the same type, i.e.
3689 * either in-place edit or rename/copy edit.
3690 */
3691 else if (DIFF_PAIR_RENAME(p)) {
3692 /*
3693 * A rename might have re-connected a broken
3694 * pair up, causing the pathnames to be the
3695 * same again. If so, that's not a rename at
3696 * all, just a modification..
3697 *
3698 * Otherwise, see if this source was used for
3699 * multiple renames, in which case we decrement
3700 * the count, and call it a copy.
3701 */
3702 if (!strcmp(p->one->path, p->two->path))
3703 p->status = DIFF_STATUS_MODIFIED;
3704 else if (--p->one->rename_used > 0)
3705 p->status = DIFF_STATUS_COPIED;
3706 else
3707 p->status = DIFF_STATUS_RENAMED;
3708 }
3709 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3710 p->one->mode != p->two->mode ||
3711 p->one->dirty_submodule ||
3712 p->two->dirty_submodule ||
3713 is_null_sha1(p->one->sha1))
3714 p->status = DIFF_STATUS_MODIFIED;
3715 else {
3716 /* This is a "no-change" entry and should not
3717 * happen anymore, but prepare for broken callers.
3718 */
3719 error("feeding unmodified %s to diffcore",
3720 p->one->path);
3721 p->status = DIFF_STATUS_UNKNOWN;
3722 }
3723 }
3724 diff_debug_queue("resolve-rename-copy done", q);
3725 }
3726
3727 static int check_pair_status(struct diff_filepair *p)
3728 {
3729 switch (p->status) {
3730 case DIFF_STATUS_UNKNOWN:
3731 return 0;
3732 case 0:
3733 die("internal error in diff-resolve-rename-copy");
3734 default:
3735 return 1;
3736 }
3737 }
3738
3739 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3740 {
3741 int fmt = opt->output_format;
3742
3743 if (fmt & DIFF_FORMAT_CHECKDIFF)
3744 diff_flush_checkdiff(p, opt);
3745 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3746 diff_flush_raw(p, opt);
3747 else if (fmt & DIFF_FORMAT_NAME) {
3748 const char *name_a, *name_b;
3749 name_a = p->two->path;
3750 name_b = NULL;
3751 strip_prefix(opt->prefix_length, &name_a, &name_b);
3752 write_name_quoted(name_a, opt->file, opt->line_termination);
3753 }
3754 }
3755
3756 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3757 {
3758 if (fs->mode)
3759 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3760 else
3761 fprintf(file, " %s ", newdelete);
3762 write_name_quoted(fs->path, file, '\n');
3763 }
3764
3765
3766 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3767 const char *line_prefix)
3768 {
3769 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3770 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3771 p->two->mode, show_name ? ' ' : '\n');
3772 if (show_name) {
3773 write_name_quoted(p->two->path, file, '\n');
3774 }
3775 }
3776 }
3777
3778 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3779 const char *line_prefix)
3780 {
3781 char *names = pprint_rename(p->one->path, p->two->path);
3782
3783 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3784 free(names);
3785 show_mode_change(file, p, 0, line_prefix);
3786 }
3787
3788 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3789 {
3790 FILE *file = opt->file;
3791 char *line_prefix = "";
3792
3793 if (opt->output_prefix) {
3794 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3795 line_prefix = buf->buf;
3796 }
3797
3798 switch(p->status) {
3799 case DIFF_STATUS_DELETED:
3800 fputs(line_prefix, file);
3801 show_file_mode_name(file, "delete", p->one);
3802 break;
3803 case DIFF_STATUS_ADDED:
3804 fputs(line_prefix, file);
3805 show_file_mode_name(file, "create", p->two);
3806 break;
3807 case DIFF_STATUS_COPIED:
3808 fputs(line_prefix, file);
3809 show_rename_copy(file, "copy", p, line_prefix);
3810 break;
3811 case DIFF_STATUS_RENAMED:
3812 fputs(line_prefix, file);
3813 show_rename_copy(file, "rename", p, line_prefix);
3814 break;
3815 default:
3816 if (p->score) {
3817 fprintf(file, "%s rewrite ", line_prefix);
3818 write_name_quoted(p->two->path, file, ' ');
3819 fprintf(file, "(%d%%)\n", similarity_index(p));
3820 }
3821 show_mode_change(file, p, !p->score, line_prefix);
3822 break;
3823 }
3824 }
3825
3826 struct patch_id_t {
3827 git_SHA_CTX *ctx;
3828 int patchlen;
3829 };
3830
3831 static int remove_space(char *line, int len)
3832 {
3833 int i;
3834 char *dst = line;
3835 unsigned char c;
3836
3837 for (i = 0; i < len; i++)
3838 if (!isspace((c = line[i])))
3839 *dst++ = c;
3840
3841 return dst - line;
3842 }
3843
3844 static void patch_id_consume(void *priv, char *line, unsigned long len)
3845 {
3846 struct patch_id_t *data = priv;
3847 int new_len;
3848
3849 /* Ignore line numbers when computing the SHA1 of the patch */
3850 if (!prefixcmp(line, "@@ -"))
3851 return;
3852
3853 new_len = remove_space(line, len);
3854
3855 git_SHA1_Update(data->ctx, line, new_len);
3856 data->patchlen += new_len;
3857 }
3858
3859 /* returns 0 upon success, and writes result into sha1 */
3860 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3861 {
3862 struct diff_queue_struct *q = &diff_queued_diff;
3863 int i;
3864 git_SHA_CTX ctx;
3865 struct patch_id_t data;
3866 char buffer[PATH_MAX * 4 + 20];
3867
3868 git_SHA1_Init(&ctx);
3869 memset(&data, 0, sizeof(struct patch_id_t));
3870 data.ctx = &ctx;
3871
3872 for (i = 0; i < q->nr; i++) {
3873 xpparam_t xpp;
3874 xdemitconf_t xecfg;
3875 mmfile_t mf1, mf2;
3876 struct diff_filepair *p = q->queue[i];
3877 int len1, len2;
3878
3879 memset(&xpp, 0, sizeof(xpp));
3880 memset(&xecfg, 0, sizeof(xecfg));
3881 if (p->status == 0)
3882 return error("internal diff status error");
3883 if (p->status == DIFF_STATUS_UNKNOWN)
3884 continue;
3885 if (diff_unmodified_pair(p))
3886 continue;
3887 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3888 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3889 continue;
3890 if (DIFF_PAIR_UNMERGED(p))
3891 continue;
3892
3893 diff_fill_sha1_info(p->one);
3894 diff_fill_sha1_info(p->two);
3895 if (fill_mmfile(&mf1, p->one) < 0 ||
3896 fill_mmfile(&mf2, p->two) < 0)
3897 return error("unable to read files to diff");
3898
3899 len1 = remove_space(p->one->path, strlen(p->one->path));
3900 len2 = remove_space(p->two->path, strlen(p->two->path));
3901 if (p->one->mode == 0)
3902 len1 = snprintf(buffer, sizeof(buffer),
3903 "diff--gita/%.*sb/%.*s"
3904 "newfilemode%06o"
3905 "---/dev/null"
3906 "+++b/%.*s",
3907 len1, p->one->path,
3908 len2, p->two->path,
3909 p->two->mode,
3910 len2, p->two->path);
3911 else if (p->two->mode == 0)
3912 len1 = snprintf(buffer, sizeof(buffer),
3913 "diff--gita/%.*sb/%.*s"
3914 "deletedfilemode%06o"
3915 "---a/%.*s"
3916 "+++/dev/null",
3917 len1, p->one->path,
3918 len2, p->two->path,
3919 p->one->mode,
3920 len1, p->one->path);
3921 else
3922 len1 = snprintf(buffer, sizeof(buffer),
3923 "diff--gita/%.*sb/%.*s"
3924 "---a/%.*s"
3925 "+++b/%.*s",
3926 len1, p->one->path,
3927 len2, p->two->path,
3928 len1, p->one->path,
3929 len2, p->two->path);
3930 git_SHA1_Update(&ctx, buffer, len1);
3931
3932 if (diff_filespec_is_binary(p->one) ||
3933 diff_filespec_is_binary(p->two)) {
3934 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
3935 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
3936 continue;
3937 }
3938
3939 xpp.flags = 0;
3940 xecfg.ctxlen = 3;
3941 xecfg.flags = 0;
3942 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3943 &xpp, &xecfg);
3944 }
3945
3946 git_SHA1_Final(sha1, &ctx);
3947 return 0;
3948 }
3949
3950 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3951 {
3952 struct diff_queue_struct *q = &diff_queued_diff;
3953 int i;
3954 int result = diff_get_patch_id(options, sha1);
3955
3956 for (i = 0; i < q->nr; i++)
3957 diff_free_filepair(q->queue[i]);
3958
3959 free(q->queue);
3960 DIFF_QUEUE_CLEAR(q);
3961
3962 return result;
3963 }
3964
3965 static int is_summary_empty(const struct diff_queue_struct *q)
3966 {
3967 int i;
3968
3969 for (i = 0; i < q->nr; i++) {
3970 const struct diff_filepair *p = q->queue[i];
3971
3972 switch (p->status) {
3973 case DIFF_STATUS_DELETED:
3974 case DIFF_STATUS_ADDED:
3975 case DIFF_STATUS_COPIED:
3976 case DIFF_STATUS_RENAMED:
3977 return 0;
3978 default:
3979 if (p->score)
3980 return 0;
3981 if (p->one->mode && p->two->mode &&
3982 p->one->mode != p->two->mode)
3983 return 0;
3984 break;
3985 }
3986 }
3987 return 1;
3988 }
3989
3990 void diff_flush(struct diff_options *options)
3991 {
3992 struct diff_queue_struct *q = &diff_queued_diff;
3993 int i, output_format = options->output_format;
3994 int separator = 0;
3995
3996 /*
3997 * Order: raw, stat, summary, patch
3998 * or: name/name-status/checkdiff (other bits clear)
3999 */
4000 if (!q->nr)
4001 goto free_queue;
4002
4003 if (output_format & (DIFF_FORMAT_RAW |
4004 DIFF_FORMAT_NAME |
4005 DIFF_FORMAT_NAME_STATUS |
4006 DIFF_FORMAT_CHECKDIFF)) {
4007 for (i = 0; i < q->nr; i++) {
4008 struct diff_filepair *p = q->queue[i];
4009 if (check_pair_status(p))
4010 flush_one_pair(p, options);
4011 }
4012 separator++;
4013 }
4014
4015 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
4016 struct diffstat_t diffstat;
4017
4018 memset(&diffstat, 0, sizeof(struct diffstat_t));
4019 for (i = 0; i < q->nr; i++) {
4020 struct diff_filepair *p = q->queue[i];
4021 if (check_pair_status(p))
4022 diff_flush_stat(p, options, &diffstat);
4023 }
4024 if (output_format & DIFF_FORMAT_NUMSTAT)
4025 show_numstat(&diffstat, options);
4026 if (output_format & DIFF_FORMAT_DIFFSTAT)
4027 show_stats(&diffstat, options);
4028 if (output_format & DIFF_FORMAT_SHORTSTAT)
4029 show_shortstats(&diffstat, options);
4030 free_diffstat_info(&diffstat);
4031 separator++;
4032 }
4033 if (output_format & DIFF_FORMAT_DIRSTAT)
4034 show_dirstat(options);
4035
4036 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4037 for (i = 0; i < q->nr; i++) {
4038 diff_summary(options, q->queue[i]);
4039 }
4040 separator++;
4041 }
4042
4043 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4044 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4045 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4046 /*
4047 * run diff_flush_patch for the exit status. setting
4048 * options->file to /dev/null should be safe, becaue we
4049 * aren't supposed to produce any output anyway.
4050 */
4051 if (options->close_file)
4052 fclose(options->file);
4053 options->file = fopen("/dev/null", "w");
4054 if (!options->file)
4055 die_errno("Could not open /dev/null");
4056 options->close_file = 1;
4057 for (i = 0; i < q->nr; i++) {
4058 struct diff_filepair *p = q->queue[i];
4059 if (check_pair_status(p))
4060 diff_flush_patch(p, options);
4061 if (options->found_changes)
4062 break;
4063 }
4064 }
4065
4066 if (output_format & DIFF_FORMAT_PATCH) {
4067 if (separator) {
4068 putc(options->line_termination, options->file);
4069 if (options->stat_sep) {
4070 /* attach patch instead of inline */
4071 fputs(options->stat_sep, options->file);
4072 }
4073 }
4074
4075 for (i = 0; i < q->nr; i++) {
4076 struct diff_filepair *p = q->queue[i];
4077 if (check_pair_status(p))
4078 diff_flush_patch(p, options);
4079 }
4080 }
4081
4082 if (output_format & DIFF_FORMAT_CALLBACK)
4083 options->format_callback(q, options, options->format_callback_data);
4084
4085 for (i = 0; i < q->nr; i++)
4086 diff_free_filepair(q->queue[i]);
4087 free_queue:
4088 free(q->queue);
4089 DIFF_QUEUE_CLEAR(q);
4090 if (options->close_file)
4091 fclose(options->file);
4092
4093 /*
4094 * Report the content-level differences with HAS_CHANGES;
4095 * diff_addremove/diff_change does not set the bit when
4096 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4097 */
4098 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4099 if (options->found_changes)
4100 DIFF_OPT_SET(options, HAS_CHANGES);
4101 else
4102 DIFF_OPT_CLR(options, HAS_CHANGES);
4103 }
4104 }
4105
4106 static void diffcore_apply_filter(const char *filter)
4107 {
4108 int i;
4109 struct diff_queue_struct *q = &diff_queued_diff;
4110 struct diff_queue_struct outq;
4111 DIFF_QUEUE_CLEAR(&outq);
4112
4113 if (!filter)
4114 return;
4115
4116 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4117 int found;
4118 for (i = found = 0; !found && i < q->nr; i++) {
4119 struct diff_filepair *p = q->queue[i];
4120 if (((p->status == DIFF_STATUS_MODIFIED) &&
4121 ((p->score &&
4122 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4123 (!p->score &&
4124 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4125 ((p->status != DIFF_STATUS_MODIFIED) &&
4126 strchr(filter, p->status)))
4127 found++;
4128 }
4129 if (found)
4130 return;
4131
4132 /* otherwise we will clear the whole queue
4133 * by copying the empty outq at the end of this
4134 * function, but first clear the current entries
4135 * in the queue.
4136 */
4137 for (i = 0; i < q->nr; i++)
4138 diff_free_filepair(q->queue[i]);
4139 }
4140 else {
4141 /* Only the matching ones */
4142 for (i = 0; i < q->nr; i++) {
4143 struct diff_filepair *p = q->queue[i];
4144
4145 if (((p->status == DIFF_STATUS_MODIFIED) &&
4146 ((p->score &&
4147 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4148 (!p->score &&
4149 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4150 ((p->status != DIFF_STATUS_MODIFIED) &&
4151 strchr(filter, p->status)))
4152 diff_q(&outq, p);
4153 else
4154 diff_free_filepair(p);
4155 }
4156 }
4157 free(q->queue);
4158 *q = outq;
4159 }
4160
4161 /* Check whether two filespecs with the same mode and size are identical */
4162 static int diff_filespec_is_identical(struct diff_filespec *one,
4163 struct diff_filespec *two)
4164 {
4165 if (S_ISGITLINK(one->mode))
4166 return 0;
4167 if (diff_populate_filespec(one, 0))
4168 return 0;
4169 if (diff_populate_filespec(two, 0))
4170 return 0;
4171 return !memcmp(one->data, two->data, one->size);
4172 }
4173
4174 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4175 {
4176 int i;
4177 struct diff_queue_struct *q = &diff_queued_diff;
4178 struct diff_queue_struct outq;
4179 DIFF_QUEUE_CLEAR(&outq);
4180
4181 for (i = 0; i < q->nr; i++) {
4182 struct diff_filepair *p = q->queue[i];
4183
4184 /*
4185 * 1. Entries that come from stat info dirtiness
4186 * always have both sides (iow, not create/delete),
4187 * one side of the object name is unknown, with
4188 * the same mode and size. Keep the ones that
4189 * do not match these criteria. They have real
4190 * differences.
4191 *
4192 * 2. At this point, the file is known to be modified,
4193 * with the same mode and size, and the object
4194 * name of one side is unknown. Need to inspect
4195 * the identical contents.
4196 */
4197 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4198 !DIFF_FILE_VALID(p->two) ||
4199 (p->one->sha1_valid && p->two->sha1_valid) ||
4200 (p->one->mode != p->two->mode) ||
4201 diff_populate_filespec(p->one, 1) ||
4202 diff_populate_filespec(p->two, 1) ||
4203 (p->one->size != p->two->size) ||
4204 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4205 diff_q(&outq, p);
4206 else {
4207 /*
4208 * The caller can subtract 1 from skip_stat_unmatch
4209 * to determine how many paths were dirty only
4210 * due to stat info mismatch.
4211 */
4212 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4213 diffopt->skip_stat_unmatch++;
4214 diff_free_filepair(p);
4215 }
4216 }
4217 free(q->queue);
4218 *q = outq;
4219 }
4220
4221 static int diffnamecmp(const void *a_, const void *b_)
4222 {
4223 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4224 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4225 const char *name_a, *name_b;
4226
4227 name_a = a->one ? a->one->path : a->two->path;
4228 name_b = b->one ? b->one->path : b->two->path;
4229 return strcmp(name_a, name_b);
4230 }
4231
4232 void diffcore_fix_diff_index(struct diff_options *options)
4233 {
4234 struct diff_queue_struct *q = &diff_queued_diff;
4235 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4236 }
4237
4238 void diffcore_std(struct diff_options *options)
4239 {
4240 if (options->skip_stat_unmatch)
4241 diffcore_skip_stat_unmatch(options);
4242 if (!options->found_follow) {
4243 /* See try_to_follow_renames() in tree-diff.c */
4244 if (options->break_opt != -1)
4245 diffcore_break(options->break_opt);
4246 if (options->detect_rename)
4247 diffcore_rename(options);
4248 if (options->break_opt != -1)
4249 diffcore_merge_broken();
4250 }
4251 if (options->pickaxe)
4252 diffcore_pickaxe(options);
4253 if (options->orderfile)
4254 diffcore_order(options->orderfile);
4255 if (!options->found_follow)
4256 /* See try_to_follow_renames() in tree-diff.c */
4257 diff_resolve_rename_copy();
4258 diffcore_apply_filter(options->filter);
4259
4260 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4261 DIFF_OPT_SET(options, HAS_CHANGES);
4262 else
4263 DIFF_OPT_CLR(options, HAS_CHANGES);
4264
4265 options->found_follow = 0;
4266 }
4267
4268 int diff_result_code(struct diff_options *opt, int status)
4269 {
4270 int result = 0;
4271 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4272 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4273 return status;
4274 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4275 DIFF_OPT_TST(opt, HAS_CHANGES))
4276 result |= 01;
4277 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4278 DIFF_OPT_TST(opt, CHECK_FAILED))
4279 result |= 02;
4280 return result;
4281 }
4282
4283 /*
4284 * Shall changes to this submodule be ignored?
4285 *
4286 * Submodule changes can be configured to be ignored separately for each path,
4287 * but that configuration can be overridden from the command line.
4288 */
4289 static int is_submodule_ignored(const char *path, struct diff_options *options)
4290 {
4291 int ignored = 0;
4292 unsigned orig_flags = options->flags;
4293 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4294 set_diffopt_flags_from_submodule_config(options, path);
4295 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4296 ignored = 1;
4297 options->flags = orig_flags;
4298 return ignored;
4299 }
4300
4301 void diff_addremove(struct diff_options *options,
4302 int addremove, unsigned mode,
4303 const unsigned char *sha1,
4304 const char *concatpath, unsigned dirty_submodule)
4305 {
4306 struct diff_filespec *one, *two;
4307
4308 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4309 return;
4310
4311 /* This may look odd, but it is a preparation for
4312 * feeding "there are unchanged files which should
4313 * not produce diffs, but when you are doing copy
4314 * detection you would need them, so here they are"
4315 * entries to the diff-core. They will be prefixed
4316 * with something like '=' or '*' (I haven't decided
4317 * which but should not make any difference).
4318 * Feeding the same new and old to diff_change()
4319 * also has the same effect.
4320 * Before the final output happens, they are pruned after
4321 * merged into rename/copy pairs as appropriate.
4322 */
4323 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4324 addremove = (addremove == '+' ? '-' :
4325 addremove == '-' ? '+' : addremove);
4326
4327 if (options->prefix &&
4328 strncmp(concatpath, options->prefix, options->prefix_length))
4329 return;
4330
4331 one = alloc_filespec(concatpath);
4332 two = alloc_filespec(concatpath);
4333
4334 if (addremove != '+')
4335 fill_filespec(one, sha1, mode);
4336 if (addremove != '-') {
4337 fill_filespec(two, sha1, mode);
4338 two->dirty_submodule = dirty_submodule;
4339 }
4340
4341 diff_queue(&diff_queued_diff, one, two);
4342 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4343 DIFF_OPT_SET(options, HAS_CHANGES);
4344 }
4345
4346 void diff_change(struct diff_options *options,
4347 unsigned old_mode, unsigned new_mode,
4348 const unsigned char *old_sha1,
4349 const unsigned char *new_sha1,
4350 const char *concatpath,
4351 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4352 {
4353 struct diff_filespec *one, *two;
4354
4355 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4356 is_submodule_ignored(concatpath, options))
4357 return;
4358
4359 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4360 unsigned tmp;
4361 const unsigned char *tmp_c;
4362 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4363 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4364 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4365 new_dirty_submodule = tmp;
4366 }
4367
4368 if (options->prefix &&
4369 strncmp(concatpath, options->prefix, options->prefix_length))
4370 return;
4371
4372 one = alloc_filespec(concatpath);
4373 two = alloc_filespec(concatpath);
4374 fill_filespec(one, old_sha1, old_mode);
4375 fill_filespec(two, new_sha1, new_mode);
4376 one->dirty_submodule = old_dirty_submodule;
4377 two->dirty_submodule = new_dirty_submodule;
4378
4379 diff_queue(&diff_queued_diff, one, two);
4380 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4381 DIFF_OPT_SET(options, HAS_CHANGES);
4382 }
4383
4384 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4385 {
4386 struct diff_filepair *pair;
4387 struct diff_filespec *one, *two;
4388
4389 if (options->prefix &&
4390 strncmp(path, options->prefix, options->prefix_length))
4391 return NULL;
4392
4393 one = alloc_filespec(path);
4394 two = alloc_filespec(path);
4395 pair = diff_queue(&diff_queued_diff, one, two);
4396 pair->is_unmerged = 1;
4397 return pair;
4398 }
4399
4400 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4401 size_t *outsize)
4402 {
4403 struct diff_tempfile *temp;
4404 const char *argv[3];
4405 const char **arg = argv;
4406 struct child_process child;
4407 struct strbuf buf = STRBUF_INIT;
4408 int err = 0;
4409
4410 temp = prepare_temp_file(spec->path, spec);
4411 *arg++ = pgm;
4412 *arg++ = temp->name;
4413 *arg = NULL;
4414
4415 memset(&child, 0, sizeof(child));
4416 child.use_shell = 1;
4417 child.argv = argv;
4418 child.out = -1;
4419 if (start_command(&child)) {
4420 remove_tempfile();
4421 return NULL;
4422 }
4423
4424 if (strbuf_read(&buf, child.out, 0) < 0)
4425 err = error("error reading from textconv command '%s'", pgm);
4426 close(child.out);
4427
4428 if (finish_command(&child) || err) {
4429 strbuf_release(&buf);
4430 remove_tempfile();
4431 return NULL;
4432 }
4433 remove_tempfile();
4434
4435 return strbuf_detach(&buf, outsize);
4436 }
4437
4438 size_t fill_textconv(struct userdiff_driver *driver,
4439 struct diff_filespec *df,
4440 char **outbuf)
4441 {
4442 size_t size;
4443
4444 if (!driver || !driver->textconv) {
4445 if (!DIFF_FILE_VALID(df)) {
4446 *outbuf = "";
4447 return 0;
4448 }
4449 if (diff_populate_filespec(df, 0))
4450 die("unable to read files to diff");
4451 *outbuf = df->data;
4452 return df->size;
4453 }
4454
4455 if (driver->textconv_cache && df->sha1_valid) {
4456 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4457 &size);
4458 if (*outbuf)
4459 return size;
4460 }
4461
4462 *outbuf = run_textconv(driver->textconv, df, &size);
4463 if (!*outbuf)
4464 die("unable to read files to diff");
4465
4466 if (driver->textconv_cache && df->sha1_valid) {
4467 /* ignore errors, as we might be in a readonly repository */
4468 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4469 size);
4470 /*
4471 * we could save up changes and flush them all at the end,
4472 * but we would need an extra call after all diffing is done.
4473 * Since generating a cache entry is the slow path anyway,
4474 * this extra overhead probably isn't a big deal.
4475 */
4476 notes_cache_write(driver->textconv_cache);
4477 }
4478
4479 return size;
4480 }
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